Hey, we're talking amps. I like where this is going.
My main amp is a 50 watt Sovtek all valve head (MiG-50).
I don't use it so much as a gigging amp, as I use it for it's sound. When I plug it into my 15" Altect cab, it sounds exactly like Dying Fetus (Stop At Nothing).
My powerhouse amp would have to be my 160 Peavey Mace head. 6(!!!) power tubes with a solid state preamp (doesn't sound too bad either). I run that into my custom (home made :P) cab which has 4 12" speakers that I got from some surplus cinema speakers cabinets. Yes, it's loud :).
7 strings pwn by the way. But my 8 string is going to dominate :)