I'm going to be playing electric bass for my high school jazz band this year, and i'm looking for an amp that would be small and portable, but loud enough to be heard. The jazz ensemble is fairly large- about eight trumpets, six trombones, four alto saxes, two tenor saxes, a clarinet, a flute, a keyboard, and a drummer on kit of course. I have a 400watt combo with a 15 inch speaker, but it weighs 80 lbs, and i don't want to have to haul all of that access weight around when i'm only going to turn the volume knob up to one or two. What suggestions would you have for an amp i could easily carry (under 50 lbs. preferably) and would have a very good quality sound? If you have no specific amp models, how many watts? what size speaker would you recommend?