I'd suggest, if you're still looking at closed, the ATH-ESW9, unless you have a big head or really big ears. They have a really nice sound, are semi-portable (I wouldn't want to wear them out and about on campus, but good for a dorm or library). They don't really leak too much, but aren't the best for isolation. They run right around $300, but don't need an amp to sound good. On other other hand, if I were living in a dorm, I'd just pick up a pair of Sony MDR-V6s or 7560s. They sound pretty good, can take a bit of a beating, and run around $80, so if something happens to them, it's not that big of a deal. Otherwise, if you can do open, see if you can get some used HD580s or 600s, and you'll have some bucks left over for an amp.