ok,
Gearhead, I appreciate your reasonable reply, but I still respectfully disagree with you and other's like Dr Jim.
OP plays jazz and doubles on slab and UR. No demonstrated need to huge volume. Players like this don't need the volume that a Black Sabbath tribute band might demand, and are usually looking for convenience, so the combo's mentioned most so far from Mesa, Genz and GK all fit that bill very well. In this same scenario (small jazz groups) I have happily used my Mesa Walkabout 12 outdoors 100's of times with great results. Remember the old GK MB150, it was a hugely popular
combo with doublers because of all the reasons I mentioned above.
and to whoever suggested upthread that combos are bad because they rattle the amp too much.
***? .. don't you suppose that an amp sitting on top of a cab gets pretty much just as much kinetic energy thrown at it as an amp that just happens to be housed inside the cabinet.
side note: I see you list Arlington Hts as your location. You go to school at Prospect ? I graduated in '75 (yes, old dude), lived over on E Wing St, by the Miner/Windsor School area. Ahh, the old days. Have not been back in many years.