Honestly, unless you're going to be using your laptop to transfer files between computers over wireless or doing a lot of LAN gaming, an N router is overkill for a college dorm room. Save yourself $50 and just get a nice wireless G router. I prefer Linksys myself, but the brand is ultimately up to you.
Also if wireless is provided by your campus, I can almost guarantee they do not have wireless N routers. So really your wireless card shouldn't be a big concern when buying a new laptop. My laptop is capable of wireless N, but I've used it maybe once. 99% of the places I go have only B/G so the extra money I spent upgrading to an N card has been wasted in my opinion.