from all the news I have so far, the stereo drivers for the 8800 cards still don't work.
RE Z800 with Quadro working reliably, we have used the NVIDIA Quadro FX 540 By Leadtek
http://www.leadtek.com.tw/eng/workst...&pronameid=157
many times. it's a low end card, but it works well enough with the z800's low resolution.
also the 7900 series cards with the consumer stereo driver work reliably.