Electric Upright Bass Database

i would suggest asking these questions to yourself and giving the most realistic answers:
transportation...what will be transporting the amp? cart? car? van? trailer? bus?
how much power do you need? is it a personal monitor only which will be reinforced by a sound system or does it need to do all the reinforcement alone... or both?
do you want a combo amp  (one piece)
or a modular system (separate processing and power and separate speaker cabinet(s)?
sounds like the one thing you do know is that you want a clean sound which won't colour your tone.
'gowl', if not there already, is easily gotten with a bit of driven transistor or even better, tube warmth, but there is some serious colour added.