The old B&W G3 works fine for most things (no gaming, editing, etc..) but music/video, etc is changing the landscape and I need/want something newer/faster. A MB or MBP would be nice. An Intel iMac would be a no brainer and good for a few years (but I don't like the one piece form). And a mini G4 would probably be adequate now. But where is that line between adequate today, not enough next year? What is the real difference between the older G4 and G5? How fast a bus is needed for what's on the horizon? Thanks.