How far away is your school? If we're talking a short drive I'd say just bring your TV with you. Also, I don't know if you'll be a continuing student or a freshmen, but I don't know of a lot of schools that have HD programming on their cable service. At rutgers we're lucky enough to have both an Antenna hookup (that's linked to a GIANT antenna at the top of our tallest building) and a cable hookup. On Mondays and Thursdays we hooked up our TV to the antenna line to get free over the air broadcasts. You might be able to do the same with an off the shelf antenna, but whether or not you get reception (for digital broadcasts it doesn't matter how good it is, only that you get it ) is what I'd be worried about.
IMHO there's no point to buying a 22" HDTV for just watching 3 shows. Chances are your college has some sort of DirectConnect hub or other internal p2p service where you can download your TV shows that you like to watch. That or you can just download them yourself off your favorite tracker (there are true 720p videos out there for 24, the office, and house).
At 22" you're not going to be that far from it, you might as well just buy a large LCD monitor and watch them at your computer. An HD tuner on anything less than 27" is a waste.