Do you think a Vintage Modern may be a perfect amp to fit right in between then? I just don't want to restrict myself to the Plexi tone. I think something more modern that the Plexi, but not as modern as something like a Kerry King 800.
not really
it's based on the JTM45, but modded with a quite high gain preamp circuit and a post phase inverter master volume (PPIMV) control
it has the bassy and round tone of the JTM, but sounds kinda fizzy to my ears
I don't think using a plexi or a JCM 800 restricts anyone, unless you want it to
that's what 90% of rock guitarists used back in the 70's and 80's and there are sooo many different tones from that era
they are extremely dynamic amps and react differently with different playing and different pedals
the JVM and the JCM 2000 are no near as sensitive
what is your price range?
it's hard to beat a good modded JMP or JCM, but a properly used stock old Marshall sounds killer