i think 6950 is more than enough for now. Until the next gen Xbox and PS comes, games are not going to be so intensive to beat the hell out of gfx cards... so 6959 is good investment for atleast next 2 yrs till Xbox and PS releases in 2013 end
see do what may by JB, but it can't be as smooth as the original one. Apple puts billions of dollars in these reserch... never seen a JB app which doesn't effect system performance in one ways or other...