1. 6800 (which is what you said) is not better than 2x6600GT6800 mate, i take it u got a SLi mobo. If so get the 6800 and then if you want more power u can save up and get another 1. but the 6800 on its own is better compared to 2 x 6600
Well you can have a crappy 600W PSU....after reading that, i got that the 2 6600s would run better, and i have a 600watt psu, so power isnt bothering me whatsoever