I have been using the Omegas for more than a year. You can tweak (change) VSYNC and Anti-Aliasing. I have used them in a GeForce 1 and a GeForce 3 64M.
I too just bought a 9600XT 128M. My first ATI Radeon. I am using Omegas Drivers for it. I wish I could send the card Back. I mean it's OK, the 128 M makes things smooth. However, the 3 games I wanted to improve were AH, AH2, and Forgotten Battles. I lost FPS in all of them. AA and AF can be used but you still suffer the FPS hit. In AH when I turn on AA X2 or X4 I get a odd line alongside my mouse arrow. UT 2003, Halo, MOHAA, and Call of Duty are pluses. Picture quality is fine but I doubt you could tell much difference between an Nvidia or a Radeon
Go to Guru3d.com and download DriverCleaner2. Follow all instructions to the letter. Go to Omegas Corner and download the Cat 3.7's. I am currnetly using the Cat 10's with good success. The Cat 3.7's seem to be the best at this time.
Omegas Corner:
http://www.omegacorner.com/index_ati.htmlDriver Cleaner 2:
http://www.driverheaven.net/cleanerMy Best,
Dracon