Just about to unbox my 2.6, 16, 512. Ordered 6/13 picked up at FedEx tonight. This will be my second Mac I've owned. Is it better to give each one a different login/username in case I want to bring some data over from my Mini, or does it not matter. Can you setup all your computers with the same login? I am going to setup as a new, and not use migration assistant from my Mini.