I've played both ways (amp on stage and only through the PA) and it kills me to play without an amp on stage. No matter how much processing / no matter how good the board and soundman, there's nothing IMHO that will ever match your bass coming through your amp. That's the way it was meant to be.

That said, many gigs, churches, etc. insist on having all instruments run through the house and minimizing the sound on stage so the overall mix can be more easily controlled. In that case, I would still recommend something like a "smaller" (relatively speaking) angled combo in a 2x10, 1x12, 1x15, etc. like Ampeg, G-K or others offer. Many of them come with a balanced out, so everybody's happy. I've never been satisfied with a sound guy telling me how my bass should sound.