i've been going w/ lower wattages for several years (decades!) now; i grew up playing loud ~100w amps (fender twin/quad, sound city 120; i never could turn 'em past 4 at a gig). then, i played a long line of ~50w heads & combos (fender/marshall/ampeg/etc). in the last few years i've tried a few nicer <30w combos, like the reverend hellhound, & carr rambler (usually set on 14w triode setting), as well as the cheap but cool fender pro jr (15w). for rehearsals/recording/small bar gigs/gigs with full PA & monitors (basically everything except loud rawk/metal), you really don't need more than 15w (IMFO). i now own a thd univalve (and a crate powerblock for backup). the ability to swap tubes, along w/ the attenuater/line out makes the univale a great choice.