Re: dorm room TUBE amp
If you can find a Hughes & Kettner Metal Screamer/Shredder, Cream Machine, or Blues Master, those are half rack tube amps that don't need a speaker load. So they can be used with monitors, headphones, or a little cabinet. I had the Blues Master (basically a pumped up vintage Champ circuit) and now I have a Metal Shredder (not really metal, more like a hot rodded Fender circuit) now and it's great. I've gigged with that alone (plus an OD pedal) and it was perfect, and I can use it as a preamp, too. Right now I use it "bypassed" (non-overdrive) as a power amp for a 2x10. Very versatile little box for college. All the Hughes & Kettner stuff is good at low volumes, and has good range on the volume knobs so you're not "either off or too loud."
Also check out the Tube Man pedals, into a studio monitor setup. Those are wonderful, and double as an amp channel expander on the floor. You can use it into the fx return of any amp to supply a versatile tube pre also.
I think the main thing you need for college is a tube preamp section, so your practicing and jamming retains the right dynamics and feel. Back in the day if I would play my Sansamp or other S.S. pres for too long at a time, it would get fatiguing not having the "real" tube dynamics.