Spend Spend Spend... you feeling rich right about now then
I'd agree with Thompson for all his reasons, my G4 450 is nearing the end of it's time (still reliable as ever even if it does occasionally chug a bit) but it's served me well for 4 years, not bad going... as usual get the best you can possibly afford
It'll make a nice dedicated Server, or maybe the girlfriend would appreciate it - I ain't sure I should subject the poor thing to that though
[edit]it would appear I'm feeling very emotional this evening[/edit]