Try ones based on 5.6, if it works weird (esp. 3DS mark 2k5 and HL2), try omegas based on 5.1.
Cats were always bugged here, even after clean install, some versions more than others.
Any of the Omegas give better results (but may be slightly slower on some games, not by much though,
if you play mostly PSX, don't even hesitate)... in my case that's prolly cause my 9800peo is 128bit, which isn't really taken seriously when Ati makes drivers