Monarchy Audio SM-70 or SM-70 Pro. Really great sounding class-A solid state amps, made in the good ol' USA. Used price is typically $300-$450 (depending on model SM-70 or SM-70 Pro).
The Monarchys do run hot (like any class-A amp), so they need a bit of breathing room.
Also, the Monarchys are pretty popular, so you can buy one, try it and easily re-sell it if you don't love it. I've owned a pair of them twice and both times re-sold them within a day or two for the same price I paid.
Enjoy,
TIC