GTX 580 vs. ATI 6970?

[mattag08]

I'm looking to upgrade my graphics card and these are the two cards that are in the running. The GTX 580 benchmarks better in almost every way, but I know the 6970 has 512MB more VRAM. I've read that CloD only uses about 1.5GB of VRAM, but I was curious if having that extra headroom makes any difference. Obviously none of the benchmarks include performance in IL-2:CloD yet.

Could people that play the game and run on a single card setup with one of the above two cards please post their system specs and performance in CloD? I know of many other people waiting to upgrade based on what you guys are finding in your games and you'd be doing us all a great service.