I'm going into an apple store tomorrow to buy a MacBook Air. I currently have a 2012 Mac Mini with 4GB RAM, 500GB HHD and 2.5GHz. The 11 inch base air will cost me £733 after education discount and gift cards. Plus I'd get a £70 card. The 13 inch base air would cost me £826 with educations discount and gift cards, again I would get the £70 card. From experience, what do you guys prefer? 11 or 13? I have a 23 inch monitor I can plug the MacBook into on my desk. Do either of them look better than the other? Am I right in thinking that if I bought the 11 inch model I could then return it and get the 13 inch within 30 days no problem?