I'm going to be a senior next year in engineering so i'm thinking about getting a macbook pro for school. I'm thinking about getting the new 2.4ghz macbook pro 13" but I got an offer from a friend who is selling his mid 2009 macbook pro 15" 2.8ghz. The price difference between the two are only $200. Is it a good deal? Which one which is a better deal? Which one would you get?