~AU$1000 gaming build. any advice?

[smackers_12]

I am building my first gaming computer and i have roughly decided on specs, i was just wondering if anyone had any advice on my build.

• 
  CPU: Intel i5-3570k
  motherboard: MSI z77a-GD55 (because i want to SLI/CrossfireX later on)
  case: CM HAF 912
  RAM: Patriot IEM blue 8GB DDR3 1600
  Graphics card: either MSI GTX 660 (non-ti) or MSI HD 7870
  HDD: WD Blue Sata 3 1TB
  PSU: Thermaltake Toughpower XT 775 watt (because again i want to SLI/CrossfireX later on)
  and a TP-Link wireless N PCI-E adaptor

i already have a keyboard/mouse/monitor

thanks for any advice.

 

[realchaos]

Are you overclocking?
Do you need an os?

 

[smackers_12]

Are you overclocking?
Do you need an os?

no i dont need an os but i will be overclocking the 3570k and the graphics card(s).

 

[realchaos]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($259.00 @ Mwave Australia)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($35.00 @ Mwave Australia)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($119.00 @ PCCaseGear)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($85.00 @ Scorptec)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.00 @ Mwave Australia)
Video Card: Gigabyte Radeon HD 7870 2GB Video Card ($235.00 @ PCCaseGear)
Case: Corsair 200R ATX Mid Tower Case ($75.00 @ Mwave Australia)
Power Supply: XFX 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($119.00 @ PLE Computers)
Total: $996.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-07-05 12:44 EST+1000)