I'm making my final decision tomorrow regarding a laptop for college. I'm going to get a business degree of some sort and I am deciding between a 13" Air or Pro. I understand that if I get the Air the memory can't be upgraded unless I do a BTO. If I get the Pro I can always upgrade down the line. The only reason I'm debating the Pro is because I would use the ODD. Besides school work I would use my laptop for casual work. This includes the internet, iTunes, a database for my baseball blog and other things. Please don't respond with the "why do you need the "pro model"" nonsense. Thanks! Oh, and ideally I'd like this to last 5 years or so.