Compatability issues with graphics card upgrade and FCP?

Hi all,

I'm looking to upgrade from my ATI Radeon 1900 (128mb Vram) grfx card in my Dual 2GHz G5. I have been looking at these cards: ATI Radeon 9800 Pro, ATI Radeon 9800 XT and Nvidia GeForce 6800 GT.

I have never upgraded my grfx card before and could do with a few pointers. Will any of these cards have issues with HDV editing in FCP? Or any issues with FCP at all?

Any advice would be mucho appreciated.

Cheers,
Mat.