Well, a solution then, would be to buy 1xeVGA ultra, and depending upon benchmarks, either buy a second one for SLI (if it seems that this would be OK for Crysis at those resolutions) or wait for the next gen, and use the step up programme.
I agree that the Nvidia cards might be better suited to crysis, but at those resolutions (which I doubt anyone even considers planning for), it might just come down to brute force of memory being the deciding factor.