ATI has been kicking NVIDIA’s *edited* as of late, while not all in performance, but delivering great cards at better prices. For what a 4870 costs now, getting a GX2 or a GTX 295 doesn’t seem justified for the price, and the very little performance increase it will have over a 4870.
1 5870 has the equivalent power to 1 4870X2. Thats why I’ve ordered one. I’ll get another around the mid-december time for crossfire.