$500 for the 256MB NV35 and the R9800Pro 256MB
Anisotropic filtering is "fixed"(for all NV3X boards, although only optimal angles were tested which impacts certain boards heavily) in terms of IQ and performance.
Quake3 the NV35 was CPU limited running 1600x1200x32x4x8(not a single FPS drop ....!). Most benches the NV35 edged out the R9800Pro, some it dominated(Quake3), some it was edged out. Appears to be some bugs in the Cat 3.4s with SplinterCell and DooM3, 5800Ultra was the fastest at SplinterCell(shouldn't be surprising actually, although I imagine it will be to some people).
DooM3 performance, the nV boards dominated. They ran benches with the Cat 3.2s as there are massive performance issues with the Cat 3.4s but the 5800 and 5900 still were significantly faster.
New revision of the 5600Ultra coming, looks to be quite comparable to the R9600Pro besting it in a decent amount of tests although not across the board by any means(competitive at least).