I'm going to be a college student this fall. I currently have a 13" mid-2010 MacBook Pro (4GB RAM, 250GB hard drive, 2.4GHz Intel Core 2 Duo). It is in fine condition (only one visible scratch on bottom, clean screen). I am considering upgrading to the MacBook Air (11" 128GB with 8GB RAM or 13" with same specs). When I get to college, I plan to purchase a 20" monitor. Should I sell the MacBook Pro and go with a MacBook Air? Also, how much do you think I can sell my MacBook Pro for? Thanks!