You have to watch the power requirements of the newer video cards. Your powersupply may not provide enough power. The radeon 9600 pro is a good video card for gaming. Your processor and FSB are real bottlenecks for any of the highend cards.

Depending on price and what games u want to play  here are ur options

NVidia geforce 5500, 5900, 6200, 6600, 6600gt.  ATI 9600 and 9800.  It has to be AGP card

R/
Don I

D4400
XP Home SP2
Bios A06
P4 2.8 GHz 400 FSB (Finally!!)
1024MB RAM
BFG 6200 OC 256 MB AGP

Does it matter who makes the card or just that it has the NVidia Geforce chip and drivers for those model numbers?  Is one company better or more compatible than the others?

Thanks for the info and suggestions!

On the nVidia end, the highest card I'd recommend would be a geForce4 Ti (not the slower MX). You could also get the FX equivilent of this as the 5700 (not the slower LE), but anything higher may be pushing it on power. Your CPU would even bottleneck these cards anyway. I don't know much of ATI's end, but the 9600 (non-pro version) is within the region of those two, but I think it's just a little bit better.

That's all I can say from what I've heard, but from experience, I have a GeForce4 Ti 4200 in my Dimension 4100. I have the 64MB model, but it's faster than the 128MB model from what I hear.