Do not grab an ATI card in the next few months. The top range cards are all in favor of Nvidia right now as it is, AND if you buy now you will miss out on GDDR4 (a new type of RAM) and the new DX10 cards just around the corner!!!
(Oh btw, ATI are on a come back with next-gen cards)
Wait 6 months... maybe 8... definately no more than a year... just think if you can put up with what you have!
crabby