I am a senior in high school. I have my laptop for about one year and half. It is a Dell 15R; it is getting really really slow. One day last week, it took over 3 mins to start Windows..... I am going to buy a mac pro this summer. But I don't know which one to choose, the high-end 13 inch or low-end 15 inch or high-end 15 inch. I am having a 15 inch laptop now. I like the screeen size; I can't imagine it being any smaller. But I do hope my new laptop to be a little lighter; my dell 15R is super heavy for me(I'm a short girl...), it was dropped once because I couldn't handle it while holding two another AP books... I am going to major in computer science and I have a part time job doing photoshop. I don't play games but I do watch movies and make videos. BTW, I don't have any desktop that I could use personally. This laptop is gonna be used 10+ hours every day. The high-end 15 inch mac pro is the highest of my budget. gotta save some money for college XP Please give me some advice!