Anyone here using the Family Plan with multiple computers? My wife and I each have our own Mac with our own music libraries. I was looking to see who's done something like this. Do you activate one phone first and then the other on the other computer? Or both on one computer and then re-sync the 2nd one on the 2nd computer? We don't even have iPhones yet, but these are the kind of things I like to know before buying something. Any advice is greatly appreciated!