Hey, just noticed your JC-55! Had one ages ago. (couldn't afford the big boy at the time)
At one point in time I had the whole stereo set, including a vintage 120. See attached image (where the 120 is not on though),
The JC-20E is more of a gimmick than anything else, since the tiny 5" speakers lack any meaningful low-end.
The JC-77 is the best allrounder, best distortion too btw, FWIW. JC-55 has been my pedal testing platform for a long time and has the nicest formfactor IMO.
When you have the 120 and the 77, the weight of the 120 offsets any benefits in low-end and headroom for gigging, so to me it wasn't worth it.
The JC-85's were more modern 77 replacements, but lacked some of the magic chewiness in the chorus' tone.
Never tried the 'reissues' (JC-40 etc.). I kept the 55 more for nostalgia's sake, but it's still a fun little amp, and after finally finding a JC-120H head, the 24" width that perfectly matches my Mesa vertical 2x12 and Marshall 1966 cabs, the awesome tone and combined with the Hetfield-connection, I'm not getting rid of that either. Recapped the filtering caps in both, given their respective ages and I pimped them a little bit by adding a chrome LED bezel around the red on/off LED, to match the look of the JC-120 combo more.