Having worked with in public schools for many years and conducting Jazz Ensembles and "stage bands", some of my favorites have been:
Polytone Mighty Brutes and Mega-Brutes
Roland Cubes (30's and 60's)
Roland Jazz Chorus 120 (big , heavy but plentiful used;check e-bay)
Evans JE200's
and Ultrasound Amps.
I like any of these for use with jazz boxes or semi-hollows/rhythm guitar stuff.
