I have a 550Ti in my rig, which isn't exactly good, and I just got the money to afford this one.

I don't want to use SLI or stuff like that, but anyone have any Crysis 2 Benchmarks for this GPU?

I don't have any official numbers, but I can tell you this: I had the 470 which ran it fairly smoothly at 1080 and ran at 720 in 3D (in both cases on the highest graphics settings). I wouldn't go all the way to saying it was silky smooth (which I would say is a solid 60+ fps), but very smooth none-the-less (i.e. never really dipped below 30 fps).

I just recently purchased a 580 myself, since I also have no interest in overclocking or SLi. I haven't played C2 with it yet, but plan to this weekend. So I'll try to give you some info then (if I remember).

I have GTX580 120-80 fps on full extream and physx

I have two MSI GTX 580 in SLI. No problems, average fraps are always over 100 and all max settings on default clock settings. It rarely dips below 100 frames. Let me know what type of Benchmark your looking for. I have 3DMark 06 and 3DMark11.