I would like to, but there's no way I could afford it right now. Plus my 6800GT is doing pretty well for its age, so I think I can hold onto it for another several months, maybe even most of this year. I do plan on upgrading for UT2007 and/or that new DX10 game from Crytek though, so that will probably be this fall/winter.
Edit: I voted "waiting for next gen".