I recently (last couple of weeks) 'traded up' from heavy Trace Elliot gear to a lightweight amp. Best decision I ever made - I was scared I wouldn't get a tone or sound that I liked but that was blasted away as soon as I went into the shop and started trying out.
I would say the very best thing you can do is allocate an afternoon, go somewhere like Bass Merchants (I did, they were soooo helpful) or wherever your nearest large bass gear stockist is and play everything. Genz Benz, various Mark Bass, various TC Electronics, Promethean, Orange, WHY. I started with the intention of buying the Orange Terror - thought I wanted a tube preamp and I liked the price. But in the end the tone didn't do it for me - and it was only by going somewhere and trying it all that I could actually make that decision.
For me in the end it was close call between the Genz Benz shuttle 6 and the TC Electronic Classic 450, which eventually won. Had I just read stuff on here I wouldn't even have tried a Genz Benz as on paper it didn't seem to fit the bill. I wish I could have afforded both as they both do slightly different things which are equally nice! It is only by listening that you get an idea.
BTW I expect everyone knows this already but the guy in Bass Merchants pointed out that one of those cheapo generic aluminium briefcases you can buy for next to nowt actually fits the Classic 450 (and so I guess most of the others) a treat. I had one kicking around unused, so recycled the packaging from the box and, hey presto, secure flight case.