Come on people stop torturing yourself!
Let's all keep focus on OSS Radeon driver and never ever install this crappy fglrx again. It's been several years and still crap.
I own a FirePRO V8750, all 3D related stuff (CAD, Gaming) I do in Windows 7. In Ubuntu Karmic, with 2.6.33 kernel the OSS driver works just fine, with Compiz, XV, EXA all fluid. The only down side is v-sync and I am totally happy about the OSS driver.
For me its either OSS Radeon or Binary Nvidia, period.