I have an Ati Radeon 9200 and Moi works fine with it, but it's not sufficent for few graphic recent progs Open Gl or recent games ;)
Don't support new system shaders
Google Sketchup Yes, Zbrush yes, 3Dcoat only in DX mode and with very low regulates, Spore (future crazzy games) No etc...
Maybe these low price models can be cool (in french but you have names :)
http://www.ldlc.com/fiche/PB00067125.html
http://www.ldlc.com/fiche/PB00062211.html
http://www.ldlc.com/fiche/PB00060171.html
old PC AGP > http://www.ldlc.com/fiche/PB00066070.html