I wouldnt pay that high for anything right now. Because when Vista comes out you wont be able to use that card. So meh.. Its a waste of money now. I mean if your gettin vista...
I'd go 7900GTX - the performance it provides is phenomenal as the high-end of NVIDIA's offerings - and you could always get another one later for SLI. It will offer you damn good performance, and at a better price than two 7800GTs.
We just went off assuming that since he presented only NVIDIA cards that it would be the only option, but he has the right to now that ATI produces some of the nicest cards around, and Crossfire is maturing nicely too. Although it feels like it's a little on the scarce side at times...