power breaks are bad for you tubes, or so i heard. to ge back to the topic, Dimebag uses solid state amps (randalls in fact) so you dont need to be looking at valves necessarily. 150 watts will be REALLY fucking loud, 100 or 50 watts will do you just fine. (although dime's amp is 300 watts or something- solid state though so that doesn't count really) Hughes and kettner do that 'warp 7' beast, which is solid state and desigined for detuned metal. Dunno if it'd be much cop though. Carlsbro have a big solid state amp as well but they're stuff is usually rank. Saying that you get a 2x12, a 1x15 and a head for less than what you would normally pay for half stack. The marshall avt 150 might be the way to go, but the avt series clip at high volumes (in my experience) and start to sound buzzy. Best thing to do as always is to got check a bunch out in a shop. remember to turn them up loud. You could also check out gear reviews at harmony central