The hybrid Artist series heads have a good reputation these days. They were mostly overlooked until the JCM800s started becoming collectible and people started looking for less expensive alternatives.
They had a great cranked sound at lower volumes, and ironically they pulled this off pretty handily with the technology back in the mid 80s than the hybrids of today.
It's kinda funny how everything is cyclical. In the 1980-90s, you couldn't give non-master volume Plexis away. Everyone wanted JCM800s. Now I'm seeing 50 watt JCM800 single-channel heads going used for $700 (and knock a couple hundred more off dual channel JCM800 heads) while original '67-'69 Plexis are commanding $3-$4k if not more.
Lots of good deals to be had on those mid-70s JMP models as well --except that so many of them have been modded. Some for the better, others not so much. It's kinda a crapshoot.