Your list is compatible, but I see many opportunities to do better.
To answer your ram question, you can use almost any speed ram with the 2700K.
But, sandy bridge is insensitive to ram speeds. Actually, your ram selection is the only pick with which I completely agree.
For your purposes, gaming will be the most cpu intensive. And, for that purpose, a less expensive 2500K will do just as well. A 2500K will drive any single graphics card to it's maximum.
The H61 based motherboard will work, but is entirely inappropriate to a "K" cpu. You want a Z68 based motherboard. The reason is twofold.
1. You can not take advantage of the unlocked "K" multiplier with a H61 based motherboard. The "K" is sold to enable you to increase the multiplier from the base 3.5(or 3.3 on the 2500K) to 4.0-4.5.
2. The Z68 will allow you to add a ssd cache to increase the performance of your hard drive. Not that I necessarily suggest you do that.
Pick your favorite vendor, and any Z68 based motherboard will do for you.
Here is a good one from ASUS: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
It is a smaller M-ATX motherboard that will fit in a smaller case if that is important to you.
Gaming performance is primarily determined by the graphics card. A GTX560ti 448 is fine for that.
A GTX560ti needs only a good 500w psu. Unfortunately, the apevia psu is not considered a quality unit.
It has perhaps the power of a good 500w psu like the Antec earthwatts 500w which costs less: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
A psu is the last place you should try to economize.
Look for a known quality brand. You can safely buy anything from Seasonic, Antec, Corsair, XFX, or PC P&C to name a few.
As to sizing while 500w is a minimum, it is not wrong to look at 600-650w. It will be quieter under load. A 600w unit can run a GTX580. With the 28nm 7979, or upcoming GTX680 that needs less power, a 600w unit will still do the job.
Here is a decent Corsair CX600 : http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
Why might you want raid-0, or even raid 5?
The performance of raid-0 is overhyped.
Hard drive failures are not common, and you need external backup to protect your data from much more likely causes, regardless.
Hard drive prices are high today. I suggest you start with a SSD.
A SSD will be 50x faster than the best hard drive in random operations which is what the os does mostly.
A SSD will be 3x faster in sequential operations.
Expect to pay $1.30 per gb for one. 80gb will hold the os and a handful of apps or games. 120gb or larger is better.
In time, you could add a hard drive for storage if you need to.
In the mean time, your PC will feel much quicker in everyday operations.
I suggest you spend $30 or so for an aftermarket cpu cooler. It will keep your cpu cooler and quieter than the stock intel cooler. Look at the cm hyper212 or Xigmatek gaia for example.
If you love the case, buy it. It is not a great cooling case, but it will do the job.
But, if you lust after some other case, consider busting your budget to buy it. A case will last you for a number of rebuilds, and you will be looking at it for a long time.
The Antec 300 illusion model has been a very popular case with great cooling: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...
1. Why RADEON over NVIDIA for the GPU (it seems like every game is optimised for NVIDIA GPUs)
2. Why is a i7 good only if you OC
3. What does the k mean in a CPU
Thank you all very much!
1. Unless you mostly play a particular game that does better on one or the other, either is about as good as the other.
Price/performance will be comparable. Nvidia updates drivers frequently, as needed, while Radeon does it on a schedule. No big deal there either.
2. I7 has hyperthreading, a facility that uses unused cycles of each of the 4 cores to give you an additional 4 threads. The extra 4 threads are each perhaps 1/4 the capability of the 4 main threads. This is useful if you are running multithreaded apps. Games rarely use more than 2 or three threads, so the extra cost of I7 does not bring much to the gamer. OC applies equally well to i5 and i7.
3. "K" suffix means that the default multiplier can be raised from 33 on 2500K, or 34 on 2600K up to perhaps 40 or so, depending on the particular chip sample.
Intel only guarantees the base multiplier, but 90% of the current chips can do 40 or better.