9000 or 9200?
I heard that 9000 works better but 9200 has 128MB...
Identical except the 9200 is an AGP8X part (and therefore is found in PCs and requires flashing and taping pins 3 and 11).
The 9000 is available as a 128MB card too.
The 8500 is faster and with its slower derivative the 8500LE/9100 also has more texture units and vertex shaders.
However, the Apple 8500 only has 64MB so any PC card flashed with an Apple BIOS will also be limited to 64MB (regardless of the built in memory).
Avoid the 9200SE or the 9250 which has a 64bit memory bus and is slower.