My new build

Here is my new build. Please let me know what you think.

Power supply
Gigabyte Superb Power Supply 550W 120mm Fan
http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=140&bid=2&sid=32501

Graphics Card
Sapphire HD6870 1G GDDR5 PCIE HDMI DP
http://www.umart.com.au/pro/products_review.phtml?id=10&bid=2&id2=82&sid=68113

Case
NZXT Guardian 921 Black Case with Blue LED
http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=139&bid=2&sid=68392

CPU
Intel Core i5 2500 Processor LGA1155 3.3GHz CPU
http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=13&bid=2&sid=71345

RAM
Kingston 8G(2x4G) DDR3 1600MHz CL9 HyperX
http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=153&bid=2&sid=73194

Motherboard
Asus P8H61-M-LE V3 Socket1155 H61 2x DDR3 SATA3 USB2.0 GLAN uATX
http://www.umart.com.au/pro/products_listnew.phtml?id=10&id2=106&bid=2&sid=73462

OS
Microsoft Windows 7 Home Premium 64bit OEM
Total Price $812 AUD

Already have 500 GB WD SATA hard drive and SATA DVD drive.