Yeah bro, if you want to spend money to put this thing together, scrap the plan and get yourself a nice pair of bose
headphones. Personal experience, your roomie will inevitably want quiet to study when you want to blast.
I second the motion - from personal experience, if you make other people's life hell, they will make yours hell. No question about it. Didn't happen to me but there were some serious disputes down the
hall and in other places on campus. Basically,
headphones are your friend, or a small desktop
speaker system. To keep my sound localized, I just have 2 sets of small stereo computer speakers and then my nice, small 2.1 Altec Lansing setup for the
desk. One set of the small speakers is for my keyboard setup (2 keyboards and a small
mixer) on one side of the room, and the other set is for movies on the opposite wall. I also have a few stereo minijack cables around the room that allow me to hook them all together if i want to fill the room with sound, at a low
level from all of the speakers (what I do when I clean my room). I also just use
headphones most of the time - because I prefer to keep my sanity as well as the sanity of others in my vicinity.
Also, the theft thing is a major issue, especially if you will have a roomate. That means two people have keys to the room other than the RA, public
safety, and housing, not just one. I know people who leave their room unlocked all the time, but I personally lock my door any time that I leave the building, and sometimes even when I'm just going down to do laundry (I'm on the 4th floor).
If you want to spend money, a decent data
projector is something to spend it on, along with a DVD/VHS combo (a lot of school libraries still have plenty of good movies on VHS) and a Blue-Ray player considering where technology is going. Get a movie night going and your room will be a popular spot, and they'll probably leave food for you accidentally. If you get a
projector, you'll want a multi-source video
switch unless the
projector has enough inputs.
If you want to get some nice small monitoring speakers, then get studio monitors. Or something like a
Crown studio amp or two and some little JBL AC15s. That could be a nice setup. I'd leave actually building speakers to the pros who have tried and true designs, unless you have a good
speaker design program or good plans from someone who knows what they're doing.