Recently i bought a BFG GTX 280 which turned out to be dead on arival. Second GTX 280, fresh install, latest drivers on Vista 64, Q9650 @ 4GHz. I was not happy with the microstuttering in Crysis, generally not very happy with it at all, so ultimately sent it back and went with my original decision of a 4870X2. Shopped around and got a brand new Sapphire 4870X2 for £340 inc vat & del

Again fresh install of Vista 64 and latest 8.12 drivers. I have to say i was totally blown away. It was like the good old days of going from a trio32 to a Voodoo 3dfx! Running Crysis V1.2.1 1920X1200 Ultra High on everything, vsync enabled. buttery smooth and simply staggering on my Dell 24"
If you have the PSU for a 4870X2 i'd highly recommend them