GTX 480 TDP is 295W, where are you getting 250W from? And sure the 5970 is a good card (2 actually but w/e) but who owns of one these? 1% of the tech community probably. I consider the 5850 the best card out there right now, 5870 coming in closely.

I don't see why you would pay that much for the 5970 unless you are doing professional work that would require its computing power. Anything else are bragging rights.