Sounds like a cool dude. I wanted an M9 or M6 but for $1200+ I could get a whole subway stack and not have to deal with the weight or maintaining them.Coincidentally, the guy I bought my 400+ from had two M9 Carbine's.
if I were a pro or semi pro I’d have an M9 though. The Subway is a great amp and you can trace a little carbine and a little 400 in it but id say the Mesa classics are still standard for recording. They have more Specialized character, where the subway line is meant IMO to offer a lot of choices to the most amount of players.