haven't tried them but i've heard really good things about them.

Check the SWR line up. The strawberry blonde may be what your looking for

I want something small/light enough to be at least somewhat easily portable (I don't drive, and getting my upright AND an amp to gigs is tricky by foot & public transit..)
Those GK Micros are only 26 lbs..

I have never used this myself, but the posts on
the GK on talkbass seem to gravitate toward the
positive. Other than that I would check out the
SWR line, as well as EA (Euphonic Audio)and AI
(Acoustic Image)

Yeah, the WorkingPro 10 seems pretty good too.. hmm.

Rey has some good advice there about the
Polytone. I used to have one, and it was one of
the best sounding small amps I ever used.

try to find a used polytone at a pawnshop or something, those little things can wail.

i have one form y doublebass and if it broke i would hunt down another and buy it again.

If its volume combined with mobility you need why not try out a PHIL JONES BRIEFCASE COMBO...



Phil Jones Briefcase Bass Combo 100W, active/passive input, compressor/limiter, 5-band EQ, balanced line out, preamp output. Power: 12V DC, 110/220V AC or internal rechargeable battery (optional). Weight: 12.8kg (28 lb)

D Silbag!

This look pretty cool

Just found out about this little guy too, looks promising.
2x 6" speakers, 150w @ 8 ohm / 250w @ 4 ohm, & only 20lbs