that is one sleek system

Yeh you should be able to put more memory into it. I have a P1 90mhz with 128mb memory and runs just fine. Just excruciatingly slow.
2.5ghz P4 will do me
Anywho b0red is right, if you have slots free you should be able to put that many more sticks in. e.g. 2 free slots another 2x32mb sticks guaranteed.
Andy