which means that if you intend to add a second graphics card later you should probably be looking at 4870 1 gig which is very similar in performance to the gtx 260
+1 @Proximon.
@OP, if you intend to Crossfire a pair of GPUs later, you will probably need a bigger PSU. Consider an Antec Earthwatts 650. Corsair, PC Power & Cooling, Seasonic, and Enermax also make good PSUs.