Video Card Upgrade

I'm hoping to find a difinitive answer on upgrading the video card in my system.

Power Mac G5, Dual 2.0, 2.5 ram.

It's a 4 year old machine with AGP not PCIe. I have FCS2 and would like to run Color. FCP 6 and Motion work on my machine but Color gives me a "you need 128 Vram to work" error and won't start.

Someone please answer - are there video cards out there short of the X800 XT (which I will buy if I can find one) that are AGP that will allow Color to run. I can find the following cards,

Radeon 9800 Pro - $279
Radeon 9600 Pro - $249
GeForce FX5200 Ultra - $299
GeForce 6800 Ultra - $849
Radeon 9800XT - $749

Please help.

Nate