Yeah MI stuff rarely pops up. I think I’ve seen like 2 gammas and 2 betas in the last few years. They’re worth it if they pop up for sure, but it sounds like you’re looking to get something in the near future. Can you show any examples of what you’re going for tonally?
One thing I will say about ANY mark series is the mark series is a very specific sound, and I’m sure you know what it is. They’re fun to play, but they have their sound and that’s what they’re good at (there are other achievable sounds, none really excel though, unless you’re talking really early mark cleans) and for what it’s worth I personally wouldn’t use a mark for any modern metal mix, or in any band setting. I just wouldn’t.
The Herbert is a real cool amp, but if you’re in a band setting you need to have the other guitar player scoop the shit out of his amp to make it work. Otherwise you will get drowned out. Some guys like the middy sound on the Herbert without the cut, I’m not one of them. 2+ and cut all day.