I have a 6800xt (256mb). Best thing out there to just keep you busy til Dx10 comes out. I run fear and bf2 no lag at all with it. Costed me $100 so its cheap too. Definitly a better buy than a 6600GT.
Opteron 175 + Scythe Infinity
2 gigs corsair XMS DDR 400
XFX geforce 6800 XT
30G Maxtor + 250G Maxtor
"Let's face it, we're not changing the world. We're building a product that helps people buy more crap - and watch porn." -- Seagate CEO Bill Watkins