Which power supply should I use?

how come those are your only two options? i would say the corsair 650hx, but of the two you provided, the thermaltake 600w SHOULD BE fine but still the corsair 650 watt would be better?

I was actually planning on buying a cooler master silent pro 700m some time this week because it had good reviews and is modular (I've been wanting to upgrade to modular for so long because it seems just so much easier to add/remove new parts). But my friend came by today and had the Thermaltake in his car, saying "This should work" and not to waste my money. Still, My single 8800gts was already generating a lot of heat which leads me to believe it uses a lot of power. So I thought I would double check with you guys. I have these two on hand so it's more of a budget option than anything else.

Okay, thanks a lot!  

Best answer selected by Easy772.