I think darksky has covered the tube issue so I'm just adding my love for the Mark III.
I'm not sure where the OP thinks the MKIII gets a 'bad rap' - I generally only hear good things about them, and I love mine.
re: the MKIIc+, I think some of it is myth, that's not to say they're not GREAT, but the MKIII matches it IMO. As always, the internet is responsible for spreading a lot of myth and misinformation. Bear in mind that some of these amps are getting pretty old, and the components age a bit. This means every amp sounds/feels slightly differently.
PLUS boogie support is first rate too - they really (seem?) to care about their products including those no longer in production.
just my 2p