For about two years I used a Carvin 300 watt monitor power amp. It was a single channel with a graphic eq. It worked pretty well since my MKIII coloseum was the tone generator at the time. My signal was:
Coloseum pre out > TC2290 with Alesis Qudraverb in its loop>left to power amp in of MKIII, >right to input of Carvin power amp. These powered a Mesa full stack and a Carvin full stack. That was in the late 80's, I eventually sold the Carvin stuff and replaced it with Mesa, but the tone was still great with that stuff, I always was complimented on the tone.
Try to find a used satellite or a 290,295,395, 400, 500. They are out there, you just have to look.