I just got my new rig built with an evga gtx260-216 55mm "ssc" 675mhz (about as fast as the original stock gtx280). Got the card from Newegg.
What a massive upgrade from nvidia 7800gs agp!
I don't plan on overclocking this stock overclocked gfx card. I hope to avoid the "PSOD" (pink/purple screen of death)...