<font color='#000000'>For a dorm, i'd agree with just using your PC for the sound system. It may not be the most convienient, but it will definately be the most space effiecient.
For speakers, i like the Onkyo GX-D90 for it's low price (about $120), reasonable sound quality for being a stereo PC speaker set, and the digital inputs (coax and digital) and subwoofer out. The set does have it's weaknesses though, one is the small woofer does not like too heavy of bass, but i feel adding a small sub will be a good fix for that. the other is mostly some colorations I have yet to tweak out of the set, but are nothing to bad.
For a sound card, any SB Live or audigy will do you nicely. If you do happen to have an N-force2 based computer witht he soundstorm audio, stick with that. The soundstorm is a bit better than the live (can't say for sure on how it competes with the audigy though), and has some very nice features as well.</font>