Kind of incomplete, as youve not mentioned what you currently have, what games you want to play/are playing, and what card/s youll want now.
If you want DX11 now, youll have to buy ATI.
If you want to wait for nVidias solution, youll have to wait at least another month or 2.
If you buy a card now, I can say, some are overpriced for what you can get than by going ATI, plus youd have DX11.
We need more info from you