Pete,
AC 30 is fine for a band, b ut remember it will sound only like an AC 30....epi jr is built for recording, and it is going to overdrive, so forget about clean. Not sure what you are trying to accomplish, but short of a Fender Showman head, if you are playing surf, any 100 watt + amp will fool the masses if it has a lot of clean headroom. Solid state bass amps are the way to go. They are cheap and plentiful on the used market, and usually have great eq features, THat and a new fender 63 reverb pedal thru your 412 cab, and you are in business. And remember to have fun when you play.
Remember, put two beers in the audience, and anything sounds good.
Mel