I think there's a point I haven't gotten across, here. I'm not talking about some chintzy, low-buck 'practice amp'.
The idea is to get away from the concept of 'a gig amp' vs 'a practice amp'.
I'm talking about a high-quality amp that delivers the sound you want, without blowing the windows out of the venu. We need to have equipment that will consistently produce the same tone [u]anywhere[/u] we play.
You shouldn't have to destroy your hearing, to get good sound. I can't imagine anything more tragic than a deaf musician. Hands up, all you guys who have enough skill at writing sheet music to pull off 'a Beethoven'??