Hmm, 5150?? no tone?
Sorry, ive played many amps, many boutique amps, and a 5150 has one of the best overdrives ive had the pleasure of hearing.
and if you want to play metal.. it sounds a damn lot more tonefull than a Mesa dual rect.. Engl' powerballs sound like them in the high gain teritory, though i find them a little darker.