You gave your own evidence for driver improvments. How did the GTX 480 go from 15-20% faster than the 5870 at launch to less than that since then? And that's including the fact more Nvidia friendly titles have been released since (e.g. LP2, HAWX2).
Hint: the 5870 got some major boosts
Big difference is that the 2900XT's were quickly shelved/forgotten... they were around only 6 months.
Biggest evidence for driver changes is the fact that 69xx performance ranges everywhere from well above 5870 to only 5870 and occasionally below. Methinks the change from VLIW5->VLIW4 is a big issue, because code has been so heavily optimized for VLIW5 since 4800's AND 5800's have been using it. Makes no sense for 384 SIMD card to be less than 320 SIMD unless there's some issues with compiling vector instructions
See: 5870 release scores/benches (below 4870X2 performance) to today's #'s (just 10-20% below the 480/570 depending on the review you look at).
Also, what display capabilities are you looking for? If you're going single card, there isn't much display wise the 570's can do the 69xx's cant at this point






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