At this point in time its pretty much better to just buy the 6970. The prices of any flashable 6950s have made it rather pointless to go that route. I think you can get the MSI hawk something 3. It isn't flashable, but MSI wrote a special bios that basically does the same thing.
Yeah I was planning on buying 6970s when I read about unlockable 6950s. Will the next generation(7xxx) have unlockable reference cards? Is that a regular happening when a new card comes out?