Okay, which one is better when it comes to performance? A high end 13" or this late 2011 refurbished 15" ? Is it a good idea to go with a 2011 15" model instead of a 13"? Here's the late 2011 15" MBP I'm thinking about purchasing http://store.apple.com/us/product/FD318LL/A Another question is that is it possible to upgrade it's ram, HDD to a 256GB SDD and it's graphics card to a newer one in the future? Since this is a refurbished computer, what are the negatives of buying a refurbished item from apple? Is it gonna have any scratch or anything on it? I have never bought a refurbished item before, this is why I'm asking those questions. *I'm a third year Industrial Engineering major and will need my computer in this field. Thanks guys.