I need some help deciding between the three. I will primarily be using it for general web surfing, music (itunes), photos, and the occasional spreadsheet or powerpoint file for work. I'll probably want to take it on trips to watch movies and stuff, and if I got a MB Air, would probably cart it around a bit more. I think the MB Air is awesome, but I'm not sure yet if its the right choice for me. It will be my primary computer, and I think I'm most concerned with battery life. I don't mind having to use an external optical drive, since I don't use them very often and I don't think the 1 USB hub would be much of a problem for me. Any advice?