[X4U] Current fastest video card?

[Sam]

Does anyone have any experience with the very latest video cards from ATI
and Nvidia? I do general design work - Photoshop, Quark, Illustrator - and
am looking for the fastest video card for those apps in a "Quicksilver"
G4/733 Powermac w/ a 4x AGP slot. I don't necessarily need the best gaming
or 3D performance.

I get so confused with the ever-changing models and numbers of the latest
cards, so I'd rather have some real-world opinions and/or links to good
reviews.

Thanks in advance.
-Sam