Take a look at the Fender 800 Pro. It pushes out plenty of power into a Goliath Senior to really move some air, and sounds pretty good. I realize it's all solid state, etc, but it sounds as warm as anything, and really puts out what you give it. The price is good, and from what I can tell, quality certainly isn't poor. It's definitely worth an audition.
The Goliath Seniors are pretty power hungry, as they aren't super sensitive and roll off pretty high, so for the best sound I suggest cutting stuff below 50-60 hz, and a bit of boosting around 100-200 hz. It uses a lot less amp power for transients, and sounds REALLY good.