[G4] video card question

[Margaret Krakowiak]

I have a G4 dual 450, gig ethernet Mac,
with an Apple CRT studio display monitor.
I'm running OSX 4.6

I just got a little Flip video camcorder
(great product, BTW), shot some video, and opened
my iWorks/iMovie 06 to do some editing.
I get a message saying I should upgrade my video
card to one that is "Quartz Extreme compatible".

I went to OWC, and they show 2 possibilities,
the Radeon 9200 PCI for about $100, and the
Radeon 9800 AGP for about $200.

My questions:
Are these my only 2 options?
What is the advantage of PCI over AGP, or
vice versa?
The 9200 PCI states it does not support OS9
on the gig ethernet model - I do have OS9.2.2
installed, and use it, though infrequently.

thanks,
margaret