AA is often not not worth the performance hit at 7680x1600 as it doesn't make much difference visually to me
Mostly agree, but some games are visually more susceptible to aliasing (NFS Shift and other car games and sims, for ex).
I guess I don't have to tell you that with 3x30" Eyefinity is a no-brainer. I used your setup for about a month but found that the number of games you can play comfortably at full res is fairly limited.
Yep, but anyway I think I´ll wait some time to choose a fermi card or 2x5870 Six. I think nvidia will possibly do something multimonitor related. And between nvidia and ati, at same specs, I prefer nvidia (3dstereo, physx and better support over the last years for niche market thing, except Eyefinity, obviously).