i would also look at another brand of psu. im not sure you need 600+ watts for this build...in fact im sure you dont. maybe a cx500 from corsair would do the trick. you should do alright (maybe not max, but good) in the cod series cause theyre not too terribly hard to max out. what resolution are you at?
I chose the Rosewill because Hardwaresecrets.com said it was very good for the price, and it reaches maximum efficiency just under 400w, which is about what this system is going to use. And 1080p, btw.