I would get a nice, gigantic, humongus laptop with premo-everything to have, and then a small crappy clunker from eBay for 150 bucks to tote around to classes. Network them, and pop necessary data & notes from the beater on the nicer one to compose your work.
You get the best of both worlds; a portable notebook that you don't need to worry about the abuse it will take from taking it from place to place, and a nice system that you can also use for entertainment.