+1 on the Blues Jr, had a guitarist dep in my band with one and it sounded superb. 1970's silverface Fender amps like the Champ and Vibrochamp are well worth considering also.
Have heard good things about the Peavey Classic but never tried one.
Trace tube amps are a real bargain as has been suggested and I think some of them offer dual power settings.
Would it be worth taking a look at Hayden amps? (Ashdown's guitar equivalent)
If someone out there could make a reasonably priced Fender Super Champ, I'd be on it like a shot.