Generally, I'd suggest using the newest one, however 10.8 was the driver iteration that got round the blue vertex problems.
Opinion is divided on whether or not one needs to completely uninstall ATI drivers now before sticking new ones in, but probably best to do it anyways.
See how you get on with that, and then try the config Coastie posted earlier.
Good luck!
Edit: Correction, it was actually 10.7 final which fixed it.
Last edited by Novotny; 02-18-2011 at 02:24 PM.
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