Picked up some used PowerMacs

[nyteschayde]

This is a decent upgrade for that old machine. It's a 500MHz G4 CPU upgrade. These work well in breathing some new life into that old machine. The biggest upgrade you can get it after that is the fastest ATI PCI video card you can find.

http://cgi.ebay.com/Sonnet-G4-500mhz-CPU-Mac-ZIF-Upgrade-G3-Beige-B-W_W0QQitemZ200378096913QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea7771d11&_trksid=p3286.c0.m14


Aside from that, you can also look into these:

G4 Mac Mini (goes a lot further in making you like a Mac)
http://cgi.ebay.com/Apple-Mac-Mini-G4-1-25GHz-256MB-40GB-Combo-Kbd-Mouse_W0QQitemZ300342164415QQcmdZViewItemQQptZApple_Desktops?hash=item45edc9bbbf&_trksid=p3286.c0.m14

Mirror Door Drive PowerMac G4
http://cgi.ebay.com/Apple-Power-Mac-G4-Dual-1-25GHz-2GB-80GB-2-CDRWs_W0QQitemZ180400967676QQcmdZViewItemQQptZApple_Desktops?hash=item2a00bc4ffc&_trksid=p3286.c0.m14