580 is the faster card in every game where resolution is below 2560 or so, except CoD. It's going to be close in CoD and you're going to struggle to get a definitive answer as we're all experiensing different results due to how new the game is and the current issues.
If I select the bomber intercept mission over London, 6 spits vs 9 HE111s, details set to max (v high), I get 40 fps for most of it (drops now and then, goes up to 60 when we head out to sea. Specs below.
If money is no object to you, and you play a lot of other games, maybe treat yourself to the 580. If you mostly play CoD, I'm not sure you'll notice much difference, so save money and get the 6970. Maybe you'll be able to CF in a couple of years.
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i7 930 @ 4.0 GHz - 6 Gig ram @ 1600 - AMD 6970 2 gig
Win 7 64 bit on 1st HDD (7200rpm) - Steam on 2nd HDD (7200rpm)
TrackIR 3 with vector exp - MSFF2 - Native res 1680 x 1050
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