9800 Pro max for G4?

[rdhatfield3]

I just purchased a radeon 9800 pro w/128 mb vram for my quicksilver G4 running at 867. I believe that this is the most powerful card for G4. If i am wrong would somebody please correct me. I am looking to max out my system with upgrades to get the most out of my system until such a time as i can purchase a G5 system. Also, any recommendations on processor upgrade cards would be nice because i have no experience with brands. Emphasis on reliability and quality over sheer performance. I've been looking at Giga designs and sonnet cards. Opinions welcome.