This fall I will be a freshman in college. This will be my only computer for the next four years. I don't need something for hardcore gaming or intensive graphics. I will mostly be using it for internet, Office (Word, Excel, Powerpoint). As a marketing major, I may need some video/graphics editing (again, nothing to high-powered). I am worried that 13 inches may be too small if I need to use multiple windows simultaneously. However, I would have a hard time shelling out $600 more for 2 inches of screen. Will the 13 inch be sufficient? (P.S. This will be my first Mac).