Selected XFree86 4.x.x during the 9.0 initial install however I am not so sure about the video performance. Desktop looks to be in 2D low res (much poorer than my 8.2 system when upgraded to KDE 3.0) even though XFDrake indicated a correct configuration. Also, for some strange reason all but my stop printer icon is absent from the desktop. Not sure whats up with this. I'd hoped updating to the latest nvidia driver would improve the graphics performance but its just killing X. I finally gave up and fresh installed with box drivers etc.
Wish I could find a defacto answer as to where the trbl lies.