Running 2x HD5850's atm. Suppose it depends on the price/performance of the 6950's when they come out. If favorable I may upgrade, if not...I may wait until the next generation. I paid $220/ea for my 5850's many months ago so the deficit selling them should not make me cry that bad.
I might consider 570's in SLI, but if they are anything like the 470/480/580's, the power draw is not something I will tolerate and they will have to be priced right.