Thanks. That's kinda what i wanted to hear. I'd like to improve my mercury playback performance. I ifigured a newer more powerfull GPU would do the trick.
I was originally going to go with the GTX 570 or 580, but I see the GTX 660 is less expensive and uses a bit less power.
If the improvement in performance is negligable, then i'll pass (and get the extra hard drive iwanted to get 
)