Rod,
Lean on your audio background when you are shopping for guitar amps. The difference between 15 and 30 watts is only 3 db barely audible, let me repeat barely audible! We use to practice in my home studio which about 25' x 30' and with a heavy handed drummer I could chase everybody out of the room with the blues Jr, with acoustic foam on every wall and the ceiling! Don't let the watts make your decision here, go for the tone. I have sold my Marshall Stack TSL 100 and all my other amps and kept the Fender blues junior. It sounds great and is EASY to lug around. If you want to push more air (get more volume) add an extension cab. If you really need more volume get a shure 57 and mic it. Tom Petty and a few others use two, but only because they run it through a chorus pedal for the effect. Tone, Tone, Tone, Find an amp you love, and IMHO one that is easy to lug around. If your Young and are playing stadiums than the later may not be as important. Bottom line a small buddy amp will be with you for life if it has your tone, the big rigs will come and go. That being said a Blues Deluxe is about 30-35 watts and that may be your thing.
Guy