I'll fraps next time I play, honestly, with it maxed out, I think my average fps will be a flat out 60, maybe higher if I take off vsync. I rarely seen it drop under 60 when I was playing. And I haven't really sat down and OC'd anything really, I opening my bios and upped the cpu multi a few notches, opening up MSI afterburner and brought it up a bit, haven't really tried to fine tune it and max it out, so it should still have a lot more in it.
Use fraps, run a bench, open the bench files in Excel and make a chart. At the res and settings you talking about, I would guess your average would be in the mid 40's which is playable, but as an average, your mins would be pretty low.