First time building Computer (gaming)

You need a much better card, you have a 250$ psu that's totally overkill and overpriced for such a brand, also drop that 250$ mobo, get a 150$ mobo, it has the same features, also a 109$ for a HAF 912, it's not good, you can find one for ~53$.
Get cheaper ram a 8GB dual channel kit for 89$ is totally overpriced, there're several out there for ~45$.
Get a 1TB caviar blue, no need to spend in a black one...
For cooling just get the CM hyper 212 evo.
Spend much more in a gfx card like a 660 ti or 670 gtx and buy a good ssd with 120/128GB.

You're spending money in REALLY weird places... i.e. wasting it.

i5-3570k

AsRock Extreme 4

8GB RAM at 1600MHz. It should be about $40, max. "High Performance Desktop
Memory" means nothing - it's a rip-off.

Get either a 670 or a 7970.

Get a WD blue, not black, and a 128GB OCZ Vertex 4

Drop the blu-ray drive. Are you REALLY going to use it, when you can stream and download anything in HD that you want?

Whatever that fan is, drop it. Spend $30 on a Cooler Master Hyper 212+, or $40 for the EVO, which has a better fan.

I'd also get a cheaper case, but that's just me.

Now, your power supply. This is the biggest issue. That power supply is very, VERY badly made, and costing about twice what it should. Buy a SeaSonic 550w power supply - it'll be more than enough for your computer, and is way cheaper, and WAY better made.

From the looks of things, you're "customizing" this computer from an online retailer, not building it. I'll tell you right now that's a very bad way to go - it's wasting a LOT of money and getting less choice and less performance.

Building a computer is actually fairly easy - it's like LEGOs for adults, and requires nothing more than a screwdriver, a couple hours, and a youtube video. Look up either Newegg or NCIX on youtube; both have very good videos on how to build a computer. Watch the video all the way through once, then go back and do it again, pausing the video to follow the steps.

Thanks for the feedback, but the pricing is High because I live in NZ so this is really the cheapest I can get for brand new parts here (that I know of), cheers.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
229.00
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
209.00 has the intel 2500 ipgpu not the 4000 and is only .1 percent slower then the 3570.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
70.00 after rebate. more that power for a 650 or 660/7850 video card.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
130.00 (with a 2 slot video card you still have one pci-x port for a wifi card or sound card that not blocked.)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
another gaming full size mb with better layout.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
34.00 after rebate.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
60.00 after rebate it only 2x slower. it a 12x drive not a 14x drive.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
48.00
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
220.00
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
210 after rebate.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
119.00 in black and white.
the case is nice as it has built in fan controllers for the case fans.

i would look into using a seal 120 rad system..less noise and better cooling if your going to hard game.
use some of the savings for 120g ssd.

http://www.cplonline.com.au/cpu.html
http://www.cplonline.com.au/power-supply/corsair-cx-750...
http://www.cplonline.com.au/computer-cases/nzxt-guardia...
http://www.cplonline.com.au/computer-cases/antec-one-ga...
http://www.cplonline.com.au/computer-cases/corsair-carb...

http://www.cplonline.com.au/motherboard/asrock-z77-extr...
http://www.cplonline.com.au/motherboard/asus-p8z77-v-lx...
http://www.cplonline.com.au/motherboard/gigabyte-g1-sni...
http://www.cplonline.com.au/motherboard/gigabyte-ga-z77...

there also http://www.umart.com.au that has good deals.

the umart link has the 7850 and 7870 for less money then the 660 video card.
if your not going to overclock the cpu you can save money by getting a locked cpu like the 3470. or the 3335.

if you could squeeze the 660 ti in the list, and a cheaper, but quality psu will be the best.
Edit for the op.

Thanks alot everyone im going too look, thanks django for putting it into nz stores great help, ill re configure my build and be back, cheers.

Okay so here is what I'm thinking now:
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($209.00 @ PC Force)
Video Card: Gigabyte GeForce GTX 660 Ti 2GB Video Card ($469.00 @ Computer Lounge)
CPU: Intel Core i5-3570K 3.4GHz Quad Core Processor 315$ @PC Force

Power Supply: FSP Group 500W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($125.00 @ PC Force)
Case: BitFenix Shinobi 109$

Memory/RAM: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($79.00 @ PC Force)
HDD/SSD:
Western Digital Blue Edition 1TB 105$@ PB tech
INTEL 330 SERIES 120GB 2.5" 170$@ PC Lounge
CD Drive: Samsung SH-224BB/BEBS 40$ @PC Force

Cooling: Cooler Master Hyper 212 EVO 56.35$ @ PB Tech

All Costing $1677 NZD Now About Operating Systems, should I go for Windows 7 Pro or Home?

I won't be overclocking my computer at first as I am new too this all, but i might later on so i think ill get a normal cpu so I have the option too overclock in the future cheers.

Go with the windows home premium 64 bits, it's cheaper, for your needs the home premium will do.

Cheers, Thanks a ton Django

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