I posted a thread in the SL a while back about thermal pastes. Mx-2 was rated A- for professional grade use. All thermals pastes are practically the same. It's the surface that determines what paste is best for use.
I use Shin-Etsu X23-7783D now and am pretty impressed, it dropped my temps a few degrees when I stripped off the old AS5 and applied it, it's really thick though and hard to apply...
i plan on getting a V8 because its one of the best, looks sexy as could be, and comparable to a TRUE in a good case, i think. its going in my build thats in my sig. and a new GPU, eventually, w'/e that is, probably gonna be a 58xx