Congratulations on getting into Harvard! I've been a Berklee student for a couple of years. Boston is great, you'll love it here.
As for headphones, you'll likely want something that isolates well, since roommates can be noisy. I'd suggest a Senn HD280 Pro or Audio Technica ES7, whichever floats your boat. If you didn't know, try to stay away from popular brands like Bose and Skullcandy, since they're incredibly overpriced or prioritize form over function (respectively). If you could spend $50 more, I'd highly recommend the Senn HD25-1-II. It isolates very well, sounds great, and is built like a tank.