New Gaming Computer

[Catsi]

I'm looking into building a new gaming computer. I've created the following three builds, but I'm not very experienced and I'm trying to find the best value for my money. I've recently moved back to New Zealand and I've found it's rather expensive to build a computer here, so would definitely like to make the best of what I can.
Any advice would be greatly appreciated. If you need any more information, just let me know and I'll see what I can find.

Build 1 - $3,037.80
Motherboard Gigabyte GA-Z68XP-UD4-B3 ATX LGA1155
Graphics 2x Gigabyte GV-N580UD-15I GTX580 PCIE
Processor Intel Core i7 2600K 3.40GHz 8MB LGA1155 - HD GRAPHICS
Memory 2x XPG 4GB DDR3 1600G CL9 DIMM 3yr wty
System Drive ADATA S510 120GB SATA3 SSD 2.5
Storage Drive WD Caviar Greenpower 2TB 64MB 3.5" SATA3 HDD
Optical LG GH24NS70 24X SATA DVDRW OEM 2yr wty
Case Coolermaster Elite 430 ATX Mid Tower Case Black 500w PSU
PSU Adata HM850 850W ATX PSU 3yr wty
Heat Sink Coolermaster SickleFlow Blue LED Case Fan 120mm

Build 2 - $1,974.80
Motherboard Gigabyte GA-Z68X-UD3H-B3 ATX LGA1155
Graphics Gigabyte GV-N570OC-13I GTX570 PCIE
Processor Intel Core i7 2600K 3.40GHz 8MB LGA1155 - HD GRAPHICS
Memory XPG 4GB DDR3 1600G CL9 DIMM 3yr wty x2
System Drive ADATA S510 120GB SATA3 SSD 2.5
Storage Drive WD Caviar Greenpower 2TB 64MB 3.5" SATA3 HDD
Optical LG GH24NS70 24X SATA DVDRW OEM 2yr wty
Case Coolermaster Elite 430 ATX Mid Tower Case Black 500w PSU
PSU Highpower HPC650 650W ATX PSU 80plus Cable Management
Heat Sink Coolermaster SickleFlow Blue LED Case Fan 120mm

Build 3 - $1,388.30
Motherboard Gigabyte GA-970A-D3 ATX DDR3 AM3+
Graphics Gigabyte GV-N56GOC-1GI GTX560 PCIE
Processor AMD Phenom II X4 960T Quad Core 8MB 3.0GHz AM3 - Black Edition
Memory XPG 4GB DDR3 1600G CL9 DIMM 3yr wty x2
System Drive ADATA S510 120GB SATA3 SSD 2.5
Storage Drive WD Caviar Greenpower 2TB 64MB 3.5" SATA3 HDD
Optical LG GH24NS70 24X SATA DVDRW OEM 2yr wty
Case Coolermaster Elite 430 ATX Mid Tower Case Black 500w PSU
PSU Highpower HPC650 650W ATX PSU 80plus Cable Management
Heat Sink Coolermaster SickleFlow Blue LED Case Fan 120mm

[RickyTick]

My vote is for system #2. The first one is overkill. (imo)

[Catsi]

I realised that I haven't put much information apart from the build here.
I'll be using Windows 7 64bit.
I don't care about fancy cases. Just something that will work, is discreet and well vented.
Primarily using this for gaming, but will also rely on it as my main media centre and for work.

Thanks!

[ARchamps]

#2 is good. I would upgrade to 8GB RAM since its not expensive. For the heatsink, I think you are looking at the fan and not the actual heatsink. Good budget ones are the Cooler Master Hyper 212+ or Corsair A50. Also, check out the ones reviewed here (http://www.techspot.com/review/475-cpu-cooler-comparison/).

Other than that, pretty nice build! Should be great for gaming. If you want to lower price, you could step down to the i5 2500K. There will be no difference when it comes to gaming.

[Catsi]

Thanks guys! I'll definitely check out your suggestions and see if I can't bring the price down a little.
Cheers :)