for pd i would recommend no card (but not no-card) (if you find an old ati mach64, this will do)
however, if you are using gem, you should look out for an openGL-hardware-accelerated card. (my personal recommendation: nvidia's geForce series. i think you will get most for your money with either a geforce2-gts or a geforce3)
mfg.cda.sr IOhannes