What 'high end' graphics card as replacement in G4 MDD?


I'm a bit confused. I'm looking for a possible replacement for my RADEON 9000 AGP graphics card. I want to aim for a card with at least 128MB ram, as I have 64 MB now. But everywher I look, I basically just stumble across ATI and nVidia cards that are labeled "G5 only".

So, has anybody either

a) a web site that has a broader selection of graphic cards for the Mac (which means more then the X800, Radeon 9800 Pro SE and the similar cards from nVidia)


b) maybe expriences with better cards compared to the Radeon 9000 Pro 64MB in a G4 MDD.

Thanks for any information on this on advance :)