Now here's a question. If its between a 2000/4000 which way would you go?
The A4000 route. It's easier to find upgrades for this one, and if upgrades aren't the main issue, you can just plug in a harddrive and CD drive from an old PC, and have a decent gaming machine, since these machines comes with a minimum of 030 CPU and the possibility to install 16 MB fast ram.