guys, if u jsut wait a bit, u'll see the 5000+ drop to the same price as the 3800+ so u see ur position, oh and N1nt3ndo did u get my PMs? im on msn now.
the 3800 X2 is going for 122 (socket 939) and around 170 (AM2) as of last night. look it up on pricegrabber.com (that 122.00 is a VERY good price. and it's dual core.) i'd say get that instead.
if you get a 7900 you shouldn't get lag at all at max settings. the processor doesn't have much to do w/ lag anyways unless you're playing a game like dod:source where the game doesn't have amazing graphics but uses alot of cpu and ram. anyways that system should have NO PROBLEM at all.