also, make sure the all-in-one has a decent shape. having one that is an odd shape will make it harder to find a place to put it in some dorms. i know i had an oddly shaped one and i had to have it on the floor under my desk (used it as a foot rest sometimes) because that is the only place it would fit, but the one i brought last year (hp psc 1350) fit on this small shelf that i had in my room. the scanner was very useful, and color pringting was conventient sometimes.
also, my school charges for printing, though it's a $40 quota per semester, so you've already paid, so it's there to use/go to waste. 5 cents a normal sheet (single or double sided), extra for other types (different size paper), 70 cents for color laser. all you do is send your print job to the server, then swipe your card at any of the printers around campus.