MOH:Airborn demo maxed @ 1680 x 1050 plays as close to perfect on my rig as I have ever seen any game run... honestly.
As for Bioshock I can't say it's perfect(and believe you me I'm extremely picky and perceptive to every flaw, glitch, stutter, etc.), but I'd say it performs better than GOW did on my X360 @ 1080i(used to have 360)if that tells you anything.
I believe Crysis won't be a problem for me maxed @ 1680, but I'll probably be playing it DX9 on XP(no vista 4 me till SP1 at least).
BTW:Just a day prior to getting my ultra, I ran the bioshock demo(maxed of course) on my 640mb gts and the performance appeared identical(if not a super tiny bit smoother strangely)so I imagine it will also handle MOH and Crysis(I OC'ed it to 600/900 from 512/792 and it scores over 10k in 3dm06 under xp).