I know this question comes up a lot but which one would be best for me. I am going to be a business major in college. I plan on doing writing/research, carrying it around campus, general email/web browsing as well. Maybe some video editing. I also plan on watching tv/sports on the computer, as well as maybe some movies. I like the 13 inch for its portability but the 15 inch for the extra screen real estate. Any thoughts on which one?