One of the guys we jam with has a Vox Valvetronix AVT50. In order to get the sound he likes, he has to crank it until it's painful. Watts aren't everything.
We play with a loud drummer, but I can keep up with him going thru a JC-60 for cleans and a Vox Pathfinder 15 (!) for dirt. Mind you, I'm a rhythm guy, I don't play leads.
We played an outdoor gig this summer, and I used the above amps with the Pathfinder slaved into the power section of a Behringer Blue Devil 60W. Folks were dancin'!
Of course, that band broke up, and I'm back on bass now...