The build looks really nice, although one thing i'd change is the GPU. Would recommend going for Radeon HD 6800 series, they're just a little bit more expensive ( 10-20$ more ) but offer far better results. Also Kingston HyperX memory performs better, so unless you're Corsair fan ( i am, best cases available ) would recommend going with kingston.

Just my opinion thuogh, the build is already great

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www.ultimae.com
Panoramic music, for panoramic people.

AMD Phenom II X6 3.5Ghz
AMD 990FX Chipset
Kingston HyperX 16GB 1600Mhz
AMD Radeon HD6850 X2 CrossFire
Seagate Barracuda Green 2TB