I just got my 6600gt in my specs... I am wondering how much of a performance increase I will see if I step up to a 6800gs (agp of course)? I am going to 2 gigs of gskill since I know that improves perf in stuff like F.E.A.R. Opinions please. Ohh BTW I will just have to pay like $100 and shipping for the new card with the Evga step up program.