I've read a lot of threads on the topic, but am still undecided. It will be my primary (and only) computer, and if possible, I'd like it to last my four years of university. My uses for it consists of simple website browsing (facebook, youtube, forums, research etc.), watching TV/movies and listening to music. I'm also interested in very light gaming; just occasional counterstrike and single-players in the likes of portal and half-life, or any other single-players that may interest me. In addition, it'll be used for music sequencing/production through logic and ableton (I'm most concerned with this as I've seen people hitting the limits of their PC even with the 15" with 20+ tracks). I'd go with the 13" if it could handle all this well because of portability and price, but I have my doubts. I'm fine with the size of the 15" as well, but the 13" would just be simpler to deal with. I'll be using a 27" at home, so size is only relevant when I'm out (in a lecture, at the library, at a friends' place, etc). I'm also not sure of the sound situation with each model. Are there any differences in this area? Will one be able make use of my (high-quality) headphones any easier/better? Could I get by with a lower end 13" (I'm not paying +$300 for high end 13")? What about the lower-end 15"? I'll get $200 off the higher end 15" and $100 off the lower end, so there will only be a $300 price differential. Thanks for any suggestions.