Help me build my gaming CPU

That's a great start to the build. What is your overall budget? Do you plan on overclocking? What games are you trying to play?

asus z97 pro wifi+ ac motherboard <-is this better than msi gaming 7?

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Let's compare the differences between the Asus Z97 PRO (Wi-Fi ac) and the Msi Z97 Gaming 7:
Memory: 1333/1600 and (OC) 1866 to 3200 MHz vs 1066/1333/1600 and (OC) 1866 to 3300 MHz
USB 3.0 (Rear Panel): 4 vs 8
HDMI (Rear Panel): 1 vs 2
DVI (Rear Panel): 1 vs None
VGA (Rear Panel): 1 vs None
Multi-GPU (SLI) Support: Quad-GPU SLI vs 2-Way SLI
SATA 6Gb/s (Internal): 6 vs 8
4-Pin Chassis Fan (Internal): 4 vs 3
Wireless Connectivity: 802.11 a/b/g/n/ac (Dual Band) vs None
Bluetooth: V4.0 vs None
Color Scheme: Black+Gray+Gold vs Black+Red

For me, I would choose the Asus motherboard for it's Wi-Fi and Bluetooth features (because I need it). The 4x 4-pin fans would also probably eliminate the need for fan hubs in case I choose a case with several fans. The Quad-GPU support is nice to have (but I personally won't be going into that route). Couple of VGA and DVI input connections would also help eliminate adapters (in case I will be connecting a monitor with limited VGA or DVI output connections). The slight differences in RAM speed as well as the SATA and USB ports are not too much of a factor for me. The only instance I would probably choose the Msi over the Asus is if the price difference is huge, such that, an Msi + a Wi-Fi Adapter would still be cheaper than the Asus.

msi geforce gtx 970 <- is the other brand better? Are they compatible?

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I am not sure what you meant by "the other brand". I'm assuming you are comparing the MSI GeForce GTX 970 4GB Twin Frozr V Video Card with the Asus GeForce GTX 970 4GB STRIX Video Card. Honestly, you can't go wrong with either, but for me, I would pick the Msi video card.

The Msi has a slightly higher core clock (1.14GHz) compared with the Asus (1.11GHz). The Msi is slightly shorter in length (269mm) than the Asus (280mm). Although both consume 2 expansion slots when fitted into the PCIe, the Msi is slightly thinner (35mm) compared to the Asus (40mm). Both have the same number of display inputs (a Dual Link DVI-D, a Dual Link DVI-I, an HDMI, and a DisplayPort). One big factor is the difference in the Total Draw Power (TDP), where the Msi only consumes 145W, while the Asus consumes a hefty 225W.

There is a good review of these two cards showing detailed comparison and benchmarks so you'll get a more in-depth idea of their advantages (and disadvantage, if any).

intel core i5-4690k <- what's the difference with i7 in terms of gaming?

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If you are comparing the Intel Core i5-4690k (which has a base clock of 3.5GHz) and the Intel Core i7-4790k (which has a base clock of 4.0GHz), then, still, not much (in terms of gaming). For hardcore multi-tasking and (if you are into) 3D rendering, then the 4 Core-8 Threads of the i7 (due to Hyper-Threading Technology) would definitely be a big plus as compared to the 4 Core-4 Threads of the i5 (without Hyper-Threading Technology). On a single-core basis, the i7 is only slightly faster than the i5. This will be evident in most games that does not use multi-cores. With the very steep difference between the price of an i7 (about $280) and the i5 (about $200), you'd be better off saving that 80 bucks and upgrade your other components. So, for me, I would choose the Intel Core i5-4690k for gaming.

I don't have money to buy those high-end components.

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I would strongly advice to check around the price-performance values of the different PC components. Then take a long hard thinking about what you REALLY NEED and NOT what you really want. More often than not, it does not take expensive high-end components to satisfy your needs (whether the PC will be used for gaming or for work). Once you have decided on your necessities (not luxuries), you must establish a budget so that you will effectively limit your cash-splurging-galore. This ensures that every piece of equipment you will buy will be the best at your given price point.

Good luck in your build!

Wanted to see the SLI build and sure enough it comes in just under $1500. This build would run a pair of UHD monitors at high settings:
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($183.99 @ SuperBiiz)
Motherboard: MSI Z97S SLI Krait Edition ATX LGA1150 Motherboard ($105.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($53.99 @ Newegg)
Storage: Mushkin Reactor 256GB 2.5" Solid State Drive ($87.98 @ Newegg)
Storage: Western Digital BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive ($111.99 @ SuperBiiz)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card (2-Way SLI) ($326.99 @ NCIX US)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card (2-Way SLI) ($326.99 @ NCIX US)
Case: Corsair 400R ATX Mid Tower Case ($79.99 @ Amazon)
Power Supply: EVGA SuperNOVA GS 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.99 @ NCIX US)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($89.75 @ OutletPC)
Total: $1447.65
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-09-05 13:47 EDT-0400

Alright, so I used the website you gave as a search for some parts.

Firstly, yes the Asus Z97 pro Wifi does have SLi capability. And no SLi is not something you need to do right now. You don't actually have to SLi ever. You only would need dual cards if you were trying to play games on ultra settings at very large resolutions and the card you have picked out is a very good card for 1080 and even a little higher.
However, after roaming around on the site you gave me, I think I have a couple of better options for a motherboard. A wi-fi adaptor is very cheap (~$10-$20USD), so I feel there's no reason to have to get wi-fi on the board.
These two motherboards are very similar and are a better price:
Asus Z97-A
MSI Z97 Gaming 5
($185)

For the RAM, I would go with the dual channel: G.Skill 4GBX2
($57)
The hard drive you found is the exact one I priced out originally, so yes it runs at 7200.
($130)
I will look up an SSD for you as well on that site. This one should do nicely: Samsung 250GB EVO
($140)
As far as power supply goes, I found one that is of good quality, it's just a little under 650W, but it's a good unit so I would recommend it: Seasonic S12II
($77)
I knew you were asking about video card, so I would go with this one: Asus Strix GTX 970
($407)
As for case I will look into that later, but that's a pretty good build right there. I don't see the i5 4690K on that site, but I would say that or the i5 4690, or i5 4590 are your best choices for processor.

Alrighty then. Sorry for all the confusion, it's definitely a little tough to switch between currencies and I know that a lot of parts tend to get inflated when transferred across borders. So from here on out we'll shoot for $800-$1000 using PC Express online pricing.

Ok, so we're still going to go with the Asus Strix GTX 970($410). This is the most important part of your gaming build because this is what drives the frame rates you'll see in game, but modern games are also using the processor more and more.

So next, the CPU. I know you want the i5 4690K, but seeing as how we've dropped the budget, you might look into something like the i3 4150. It's a dual core with 4 threads, so it acts like a 4 core CPU and it has a good clock frequency. This will be good enough to run the latest games, but if you must have a 4 core i5, I would recommend the i5 4570, or, at most, the i5 4590. We'll use the i5 4570 price for right now ($190).

It would appear that the next thing we would look at would be the motherboard, but at this point we have decided upon the two most power hungry items in the build. So we need to look at power supply. This is one of the most commonly overlooked components in a lot of computer build, especially gaming and work stations. If you don't get a quality unit it can fry your machine and damage all those expensive components, so we don't want to skimp here. This forum has a great list of power supply units (PSU) tiered by quality, but I've already scoured most of it, so I know a lot of the good units off the top of my head. After looking through PCEx, I've found 2 units that are of sufficient quality that I would feel comfortable with them in my build. The first unit is the one I suggested earlier: the Seasonic S12II 620W. The second is: Antec VP550P 550W. Now the Seasonic is going to be tier 2, while the Antec is going to be tier 3. The difference is the quality of capacitors used. Now obviously it would be nice to use the best PSU you can, but we're also on a budget, so tier 3 here wouldn't be a bad idea, but if you ever decide to put in a second card, the Antec unit is not going to be enough. So if you want to spend a little more now for a higher quality and more capacity unit, the Seasonic is a very good unit. If you don't think you'll be expanding too much past your current build, I wouldn't worry too much and the Antec will be a great budget choice. I'll use the pricing for the Seasonic for now ($77). The only other thing to compare them would be that the Seasonic is modular (meaning the cables that come with the unit can be unplugged and stored away if not needed) and the Antec is not (all the cables come attached and you get no choice in the matter).

So at this point we've chosen all the most important components and we're at $680. We're in a really good place here because we have a lot of choice left.

For the motherboard we'll be looking for a few features, but we'll be looking to keep it near $100. I would go with either the MSI Z97 PC Mate, the MSI H97M-G43, or the Asus H97 ProGamer. I think my top choice there is the MSI PC Mate, but it's up to you. We'll go with the PC Mate's pricing, for now ($112).

There's not a lot of choice on the PCEx website for RAM, so we'll have to go with the GSkill Ripjaws 2x4GB ($57).

For a hard drive, terrabytes are the standard size now so we'll go with the WD Blue 1TB 7200RPM ($52).

After looking through most of the cases, this one really jumps out at me. Let me know if you like the look, but for a card as long as the 970 is, this looks like the first option I've seen that will work, that is also a good looking case and has good/modern features. Unfortunately the cable management isn't the greatest, but you should be able to sneak most of them behind the HDD cages. This is where the Seasonic PSU would really shine because you only have to use the cables you need and everything else can be taken out. The Thermaltake Versa G2 ($43).

This puts us to a total of $941. Now I have just been using the PCEx website and Google currency conversion to get US prices, so let me know if this actually fits in the budget when you look on your end. To recap (no links):
$410 - Asus Strix GTX 970
$112 - MSI Z97 PC Mate
$190 - i5 4570 3.2Ghz
$77 - Seasonic S12II 620W
$57 - GSkill Ripjaws 2x4GB
$52 - WD Blue 1TB 7200RPM
$43 - Thermaltake Versa G2
$941 - Total

Give it a look and let me know what you like and what you don't like.

How much is your spending limit in Php? I'll look into locally available websites too and suggest a build for you.

Yes you are correct. If you want to overclock your processor you need the "K" suffix. You need to ask yourself though, what is this build for? If this build is primarily an enthusiast setup so that you can overclock and tinker, then yes upgrade the CPU and downgrade the GPU.
However if this build is primarily for gaming, you do not NEED the unlocked CPU. I had the same issue. I wanted an unlocked CPU, but it wasn't the best CPU for my purposes, so I chose a different CPU so I could get a PC that performed better for my primary goal.

So with that in mind, do you NEED the "K" CPU? I don't know. Only you can answer that. To make this gaming build you do not need an unlocked CPU.

Also you are correct, you don't need the GTX 970 for games such as DOTA2, Dragon Nest, and Heroes of the Storm. However for Assassin's Creed, especially Unity, to get good FPS, you might want the 970 depending on what resolution you are playing on. 1080, 1200, 1440, 2180, all have different requirements. If you have a 1920x1080 display, the 970 might be overkill for all but the latest and greatest games. Anything bigger than that and your graphic requirements go up quickly.

On this note, do you have a monitor currently or is that something you need to buy too?

So I need to know what you are planning to do with this computer because initially you stated that you wanted a gaming build. If you still want that, I stand behind my recommendation of the 970 being the staple of this build as it will get you the best performance at this price point. However if having an unlocked CPU is a must have for you, then drop the 970 to a 960 and just upgrade the CPU to the 4690K. I wouldn't change the motherboard (from here on out referred to as "mobo"). I see no reason to upgrade as you aren't getting 2 PCIex16 slots. The next step up still only gives you one x16 and two x8 in SLi, so I just don't see the purpose in getting the more expensive mobo. Honestly if you lowered to the 960 and went with the 4690K, you'll probably save money from the original build I supplied. At that point I would recommend adding a modest SSD.

Alrighty then. Sorry for all the confusion, it's definitely a little tough to switch between currencies and I know that a lot of parts tend to get inflated when transferred across borders. So from here on out we'll shoot for $800-$1000 using PC Express online pricing.

Ok, so we're still going to go with the Asus Strix GTX 970($410). This is the most important part of your gaming build because this is what drives the frame rates you'll see in game, but modern games are also using the processor more and more.

So next, the CPU. I know you want the i5 4690K, but seeing as how we've dropped the budget, you might look into something like the i3 4150. It's a dual core with 4 threads, so it acts like a 4 core CPU and it has a good clock frequency. This will be good enough to run the latest games, but if you must have a 4 core i5, I would recommend the i5 4570, or, at most, the i5 4590. We'll use the i5 4570 price for right now ($190).

It would appear that the next thing we would look at would be the motherboard, but at this point we have decided upon the two most power hungry items in the build. So we need to look at power supply. This is one of the most commonly overlooked components in a lot of computer build, especially gaming and work stations. If you don't get a quality unit it can fry your machine and damage all those expensive components, so we don't want to skimp here. This forum has a great list of power supply units (PSU) tiered by quality, but I've already scoured most of it, so I know a lot of the good units off the top of my head. After looking through PCEx, I've found 2 units that are of sufficient quality that I would feel comfortable with them in my build. The first unit is the one I suggested earlier: the Seasonic S12II 620W. The second is: Antec VP550P 550W. Now the Seasonic is going to be tier 2, while the Antec is going to be tier 3. The difference is the quality of capacitors used. Now obviously it would be nice to use the best PSU you can, but we're also on a budget, so tier 3 here wouldn't be a bad idea, but if you ever decide to put in a second card, the Antec unit is not going to be enough. So if you want to spend a little more now for a higher quality and more capacity unit, the Seasonic is a very good unit. If you don't think you'll be expanding too much past your current build, I wouldn't worry too much and the Antec will be a great budget choice. I'll use the pricing for the Seasonic for now ($77). The only other thing to compare them would be that the Seasonic is modular (meaning the cables that come with the unit can be unplugged and stored away if not needed) and the Antec is not (all the cables come attached and you get no choice in the matter).

So at this point we've chosen all the most important components and we're at $680. We're in a really good place here because we have a lot of choice left.

For the motherboard we'll be looking for a few features, but we'll be looking to keep it near $100. I would go with either the MSI Z97 PC Mate, the MSI H97M-G43, or the Asus H97 ProGamer. I think my top choice there is the MSI PC Mate, but it's up to you. We'll go with the PC Mate's pricing, for now ($112).

There's not a lot of choice on the PCEx website for RAM, so we'll have to go with the GSkill Ripjaws 2x4GB ($57).

For a hard drive, terrabytes are the standard size now so we'll go with the WD Blue 1TB 7200RPM ($52).

After looking through most of the cases, this one really jumps out at me. Let me know if you like the look, but for a card as long as the 970 is, this looks like the first option I've seen that will work, that is also a good looking case and has good/modern features. Unfortunately the cable management isn't the greatest, but you should be able to sneak most of them behind the HDD cages. This is where the Seasonic PSU would really shine because you only have to use the cables you need and everything else can be taken out. The Thermaltake Versa G2 ($43).

This puts us to a total of $941. Now I have just been using the PCEx website and Google currency conversion to get US prices, so let me know if this actually fits in the budget when you look on your end. To recap (no links):
$410 - Asus Strix GTX 970
$112 - MSI Z97 PC Mate
$190 - i5 4570 3.2Ghz
$77 - Seasonic S12II 620W
$57 - GSkill Ripjaws 2x4GB
$52 - WD Blue 1TB 7200RPM
$43 - Thermaltake Versa G2
$941 - Total

Give it a look and let me know what you like and what you don't like.

Either of them are great. The "dragon" edition has ~40MHz faster clock speed. You would not notice a difference between that one and the "tiger" OC edition.