SWR California Blonde. Designed for an acoustic instrument with a big enough speaker to handle the low B of my 5 string Tacoma, a big enough amp to drive to moderate levels, a tweeter to bring out the acoustic overtones, and a SOUND to DIE FOR.
SWR BBII or I. They have an input that is buffered for piezos and sounds incredible with solid body basses too.
If I was in the market, I wouldn't buy anything till I tried those MarkAcoustic amps. As much as I like the LM II, I expect no less out of the MA amps.
You might check out the AB50 from acoustic. www.acousticamplification.com There is a user review in another thread on this forum: http://www.talkbass.com/forum/showthread.php?t=376710&page=3&highlight=149.99