For that sound, to me, the OG JMP 2203 is the pinnacle. Need more drive? Hit it with anything, even a Boss DS-1 sounds good. Without having the 2203 sound as the basis in my head, everything else was just circling an elusive target. The JVMs and JCM2000s are great amps, but they're not that.
Having said that, the best thing I've tried for the modded Marshall thing is the Jose. Back in the mid-80s, those sounds I grew up on, the Jose just nails it. No, it's not a Marshall, but it's really damn close when all the mods are turned off, and with them on, it's perfection for those sounds that are ingrained in my psyche.
Having said that, the Bogner Helios is an incredible amp. It's like the Jose, just with a touch of Bogner. Think mid/late '80s Scorpions to Alice in Chains. It's thicker than the Jose, but is the most Marshall sounding amp Bogner's made, IMHO. 99.9% as good as the Jose, just a little different