I'm in university and I think it's time to buy a MacBook Air. A month ago I blught an IPad and I'm very happy with it. Last week I went to a store and saw a MacBook Air that was awesome. So Indecised ti buy it. I'm going to buy 4gb ram and 128gb SSD model. Which screen size should I prefer. In my country apple prices are so high. 11 inch model is $ 1700 and 13 is $1800 so there isn't much difference between them. My purpose of using it is checking my mails, facebook, web seraches and Iwork, Ilife, MS Office. I will carry it all day so does 13 inch make big difference in that? Battery is important but Inthink I can handle it. Which one should I prefer? Regards.