Hi, im new to the mac world, having used PC's my whole life. Im in my second year of uni, and my PC is getting pretty long in the tooth, so i thought, hey why not go for a MacBook? Im torn between the 13" 2.13GHz MBA with 4Gb RAM and 256Gb SSD, and the 13" MBP with 2.7Ghz, 8Gb RAM and 500 or 750Gb HD. Most of my activities while on my laptop are web surfing, downloading and watching multiple TV series, movies, and music, and writing and researching essays. your opinions would be a big help. thanks. also im contemplating purchasing a Colcasac sleeve for the one i choose, has anyone had any experience with them?