If you're not using it for gaming, there's no reason to avoid PCI Video Cards that I can think of offhand. That's what I've used in my DA. For Graphics work they're fine. In the case of the DVD Decoder DaughterCard on one of my ATI VidCards, that combo would probably have been a better choice, when my DA was still my main machine, than a Dual Head AGP Card would have been for use with the DVD/CD SuperDrive upgrade I always wanted.

A three display setup is da bomb! :approve:

If your AGP Card is good enough, watch for a couple of PCI cards that you can share with pre-AGP Macs. But the AGP Card that AF linked looks great as well.

Dunno, YMMV, most do.