I don't mean to hijack your thread, MasonAtom, but I had a question that was along the same lines.
When I buy a PowerMac, I'm going with the stock hard drive option. Soon after that, I'm hoping to add a 250 GB SATA HD. My question is, how do I image one hard drive to another, so the added 250GB HD will now be my boot drive, and the 80GB that the PowerMac shipped with can be formatted as a scratch drive?