Avid Xpress Pro System Requirements
Avid actually don't need a Quadro Fx card at all. I have Quadro Fx 4500 (why 4500 not listed in Avid?) in my main PC and Geforce 7600 in another one, running MEDIA Composer on both. Don't trust on theory. Realtime Open GL effects is now possible with a higherend Geforce or Mojo.
Yes, I know Quado is perfect for Avid Softimage and for Avid 3D. And AVID guaranteed that Guadro works perfectly with Avid. That not means other don't work!!! For personal use, no need of a Quadro. Yes, I highly recommend to buy a Quadro 1500/4500 for business use. It will worth for the money!!!!
Check this: Editing Systems : Avid Xpress Pro Editing Workstation
Have you worked in Avid before?