I'm not trying to sound like a **** but I totally couldnt care less about the ATI 6000 series!!! (from a purchasing point of view)
Lets face it, if at any time you buy the flagship nvidia or ati card its gonna be pretty damn good and should last you for a while before you really NEED to upgrade.
I'm not an nvidia fanboy as I had a 5870 Vapor-x that I sold to part fund this card.
The GTX 480 is the best / fastest single GPU card in the world at the moment, and the KFA2 Anarchy edition deals with the heat and noise issues of the standard design; which were the only down sides of the 480 as far as I'm concerned.
I loved the look of this card..blue PCB, nice beefy cooler and the silver backplate. Plus nvidia do have the edge in driver performance and stability.
If we were all worried about what is coming next tech-wise nobody would ever buy anything...and by all speculative accounts so far the ATI / AMD 6000 series isnt going to be anything groundbreaking!!!