A am running 2048x1152 on my 8800GT, we don't play the likes of Crysis thankfully so until we find a "must play" game that canes the existing cards we have some breathing time.
Just worries me a bit having no decent emerging upgrade path. Also, there seems to be a move away from single slot designs as part of the customisation that board makers do (hence only the early 4850 & 8800GT boards were single slot).