Is it a shuttle system? If so, then the system could probably handle something decent like a nVidia 6600. If it's a generic PSU, I would say ATI 9200 would be the highest I would go.
okay, kol. Thx for the advice. Does anyone know if it will run FS2004 with great graphics. In my system i will also have 1 gig of ram, a 200 gb hdd and a p4 2.66