JVM is a great amp but way oversaturated to the point it sucks a lot of the tone (about 3 resistor swaps should fix that)
also, the way the hottest lead channel gain pot is wired makes it impossible to tame the gain down to a reasonable level
I have a completely rebuilt 50 watt 1973 JMP as my main amp
the only stocks things are the transformers, some of the pots, the main turret board and the headshell
it was modded by some mysterious shop in california (not sure if was some of the famous modders) and lately fine tuned by me and my friend Zambelli (great amp maker, and I also own a custom amp built by him)
the amp is a single channel, but has two master volumes (not sure why), a tube buffered loop (which I never use and can be skipped by not using a push pull knob) has some sort of bassy and darkish high gain circuit (it was a lot darker before we tweaked it), somewhere between a custom audio OD50 and a bogner shiva or something, but somehow retains the plexi tone till mid gain settings
the thing is... it may have almost as much gain as a mesa recto, but when I set the gain around 4, it sounds pretty clean with lower output pickups...
when I need real gain, I just activate my ts9dx and the amp ROARS
the Zambelli amp has 2 hotrodded marshall-like channels with 2 modes and I never switch channels or modes as well... I just set things in a way I can get my cleans from a medium high gain channel
so, the point is that you don't need two channels unless you want fender-like cleans, and that's something you won't find in any marshall
from your list, I'd just pick a master volume JMP and tweak it a bit
have you heard the Egnater Seminar?
it's just a slightly modded JMP/JCM
just added gain here and there and a pretty simple channel switching circuit
