The others look used and won't run the latest for the same reason. So that gives the Xeon as the only one to choose from.
I am a Graphic designer and need a new computer. I currently have a G4 Power PC with version 10.3.9 installed and i tried to upgrade it again because i cannot afford a new computer. Doing some research I found out that i cannot upgrade to leopard or use the new CS3 programs as they are not compatible to 10.3.9 . I create Graphics for print ,web and 3D .What does someone recommend since Price is the issue . i was looking at the Apple Power Mac G5 - PPC G5 1.6 GHz ,Apple Power Mac G5 (1.8GHz, 256MB RAM, 80GB HDD),Apple Power Mac G5 - PPC G5 2 GHz,Apple Mac Pro Dual-Core Xeon 5150 2.66 GHz.