Pentium 4 HT graphics card upgrade?

i have a pentium 4 2.6HT with 4 gigs of ocz ram thats running at normal speed. wats the best agp 8x card i can run. chipset is a (intel d865glc) dont care how much and no i do not want to upgrade so dont tell me i should prob just upgrade. also wats the next best CPU i can stick in it as well think i could go to the 3.2 HT. CPu not that important just tell me whats the best graphics card i can run. or whats the best graphics card thats out there.