I've had higher powered Marshalls in the past when i gigged a lot. Times were different then also.
I've toyed with the idea of of a JTM45 or 1987X lately. I have the SV20H and 2525H Studio heads. Very happy with the tones they produce. I'm sticking with them because I prefer a cranked up amp. It's hard to do that these days with any more power than that. Buy what you can use is my advice.
I have an attenuator, so volume isn't really an issue, the main drawback to the JTM45 and 1987X for me is the ungodly weight. Well I guess the JTM45 isn't really that heavy, but when you add in a cab, a pedalboard and a guitar, the 5 or 6 kilos that the SV20H shaves off the total weight really come in handy. Not to mention smaller form factor and easier to carry.
How would you compare the clean/edge of breakup tones on the SV20H and 2525H, volume and tone wise? What about vs a reasonable drummer in a rehearsal room?