I have a 17" Toshiba that the PowerBook will be replacing.
The pain of Win XP is probably far more than a bit of Mac sluggishness. 1.67Ghz G4 plus 1/2 GB of RAM should be plenty.
I'll also give away my Dual Opteron in the process. It'll go to my new Linux sysadmin, with the caveat that it must never be in any type of production environmnet so I can rebuild it to test things at will.
It heats up my new office too much.
I want to consolidate to a single box if possible. But if not, then I can keep the Toshiba.