Good stuff, and I agree. When I have played pickup-equipped acoustic through my Fender Princeton SC, I get excellent results, but I admit it does sound best through a dedicated acoustic amp.
One other idea: A dab (and I do mean just a "dab"

of chorus really makes ampified acoustic tone blossom on any amp. Chorus pedals are not expensive (my amp has chorus built in - many others do, too). But if you want a dual-duty amp, go for one that is famous for it's "clean" tone (almost any Fender, to name one brand). I don't think a Marshall would be a good choice for amplified acoustic, though I'm sure there are folks that get good results that way.