New video card to max out games

Hi all, im buying a new pc and im looking for a new gpu that can suport all games on ultra. Im was thinking in buy the gtx680 but shes out of stock in every single place...So im hear to ask u guys what i should buy isntead, i was thinking in 2 gtx 570(well i want to avoid this because is to expensive) in sli or a radeon 7970 or a gtx 580

Whats resolutions do you plan to play at?
What games?
Whats your budget for the upgrade?

Im want to play in the highest resolution( not in 3d), games like bf3, 500~600 dolars at max

7970's just had a price cut, they're pretty much have the same performance/price ratio as the 680 now.

but if i put a 7970, it will be enough to play bf 3 on max resolution?

Max resolution depends on what monitor or monitors you have? Like my Max is 1920X1080p
Yes the 7970 will allow you play the game on max settings.

thx guys

Well on full ultra on BF3 at 1080p I get about 55fps avg/45fps min on the large multiplayer maps.
Tone down to 2x MSAA and it's pretty much 60fps min.