My personal opinion (and what I do): Stick with SreeD.  It's slightly slower than OpenGL, in all relativity.  (as in, yes, it can be clocked as significantly slower, but when all is said and done, it's still fast enough to fold into your workflow).

IIRC, ATI drivers and OpenGL don't get along all that well without heavy tweaking and know-how.  I really hope someone who knows comes along to help you out, because I kind of seem defeatist, LOL.

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