I currently only have a MacBook Pro (late 2008, 2.4ghz) but was thinking about perhaps buying a Mac mini, or something very quiet that could be left on safely 24/7. I would run SecuritySpy and iCam so that I could be notified on my iPhone when there is movement etc. What would you guys recommend? So...should I be looking to buy a 'new' Mac? (As in a used Mac Mini or something?) Or just leave my MacBook Pro on all the time? How quiet are the G4 Mac Mini's?