After EXTENSIVELY comparing two original, built by ATI, Radeons, against a Gigabyte 7500, a PowerColor 9000 and a Sapphire 9000 on an 8" CRT:
the original Radeons seemed slightly worse than the newer ones, with slightly (if any) inferior "resolution" and a bit more noise.
the last three cards looked almost exactly the same. The Powercolor had a "fuzzier" Win display, and it's overlay was perhaps slightly worse than the Gigabyte and Powercolor. It seemed to resolve less detail and have less saturated colors. 3 people that did this comparison were never sure about this, though, since we honestly couldn't pinpoint the differences.
We saw NO difference between the Gigabyte and the Sapphire, however, so they came out on top. Note that MParker and other forum members believe the 9xxx series to perform better than previous versions, but we simply could not tell.
Note that ANY 9000 (not Pro) should not have any fans, whilst the 7500 usually have a fan.
Drivers, etc, were not a problem with either card.
Tests were done using Catalysts 2.3, Cinemaster 4.0 and PowerDVD XP (I only have one Sonic registration) with 5 different PCs running.