Welcome to Talkbass where you'll find plenty of opinions about how acoustic basses are worthless, Fenders are for old men, Rickenbackers cost too much, and Sires are the best basses ever made.
Seriously though, no one loves acoustic basses more than I do, and since you're talking about plugging in, you won't find anything better for $400 or less than the Dean Exotica...the old model before the damned fools changed the preamp!
The old models have the Aphex System with Aural Exciter and Big Bottom Sound. The new models? Doesn't really matter what they use...the Aphex System can't be beat.
I get a plugged-in tone out of my Exotica that I can't even get out of my G&L L 2000.
Put on the proper strings...D'Adarrio black Tapewounds...and get a sound-hole plug and you'll forget all about every other acoustic bass. I certainly have.
The Exotica sells for $399 new but I got mine for $250 used with a molded ABS case from Guitar Center. When I gave it a test drive, I had a crowd in the bass room listening to me. Believe me, they're that good. There's usually a few on ebay or reverb for under $300 if you can't find a used one at GC online.
This is my second Exotica and if I find a black one, I'll probably buy it. I get more compliments about my Dean than I get about any bass I've ever owned.
By the way, I had the regular Dean acoustic, but the simple truth is, the electronics are somewhat lacking, to put it nicely.
One last thing, I have a Roland Micro Cube for barbecues, camping, or one last post apocalyptic gig. I believe in the MTV Unplugged school of thought...Plug In!