yeah the R300 was a super chip and still is that one made 3 massive victories, it first beat the Ti4600 with ease, then the 5800Ultra and even with the 5900Ultra it made it's best place, at the top, with all settings set @ max details FSAA + AF at max the 9700 pro was faster in anygame. the GeForce FX 5950 Ultra was the only card that could barely beat it , so it's obvious the 9700 Pro still has enough juice to keep up even with games of today

the 9700 Pro effect will be something hard to replace, some say that a 8800GTX had a 9700 Pro effect on ATi if it would it would have to be faster than the following 2 ATi generations which I doubt see happening

the R600 how ever will also be a very intersting thing to observe, the GeForce FX serie was fast in DX8 but slow in DX 9, the * serie is indeedly fast in DX9 but I think it will meet it's bottleneck in DX10 and ATi will justy slide in without probs like 9700 Pro did thanx to it's 256Bit 8cross Laned Memory interface and that it was 100% DX9 compliant and still is ofcourse

My favourite group of ATi cards is the R4.xx High End series.
R420:
ATi RADEON X800 SE AGP 256MB
ATi RADEON X800 Pro AGP 256MB
ATi RADEON X800 XT ALL-IN-WONDER AGP 256MB
ATi RADEON X800 XT AGP 256MB
ATi RADEON X800 XT PE AGP 256MB
R423:
ATi RADEON X800 SE PCI-E 256MB
ATi RADEON X800 Pro PCI-E 256MB
ATi RADEON X800 Pro CrossFire Edition 128MB
ATi RADEON X800 Pro CrossFire Edition 256MB
ATi RADEON X800 XT PCI-E 256MB
ATi RADEON X800 XT PE PCI-E 256MB
R480:
ATi RADEON X850 Pro PCI-E 256MB
ATi RADEON X850 Pro CrossFire Edition 256MB
ATi RADEON X850 XT PCI-E 256MB
ATi RADEON X850 XT PCI-E 512MB* [Prototype, never produced]
ATi RADEON X850 XT PE PCI-E 256MB
R481:
ATi RADEON X850 Pro AGP 256MB
ATi RADEON X850 XT AGP 256MB
ATi RADEON X850 XT PE AGP 256MB
R430:
ATi RADEON X800 VE ALL-IN-WONDER AGP 256MB
ATi RADEON X800 GT AGP/PCI-E 256MB
ATi RADEON X800 GT ALL-IN-WONDER AGP 256MB
ATi RADEON X800 AGP/PCI-E 256MB
ATi RADEON X800 XL AGP/PCI-E 256MB
The R430's were made after the R481's as to fill in the gaps

Quite a shame that the 512MB R480 was never put to mass production but then with XT PE speeds, that would of been a very nice card.
The R481 is a remake of the R420 the R480 is a remake of the R423, the speeds of the R480's class types is the same as that of the R481 types. sames goes for R420 types as R423 types.