A thunderbird with a 266 fsb will do nicely the larger chache will help more then spending less money on the duron, I know as I have a T-Bird and I have used a duron at the same speed as my T-Bird. My T-Bird was way way faster in programs like Diablo 2, Need For Speed Porsche, and 3D Studio Max 3. Those programs realy work a system and in my opinion, showd me what machine is better.