Mario,
Interesting in your spec list for the MB2, as GK does have a tubed version in the works. I saw a prototype at the NAMM show this year. Of course, I asked about availability, and was told late this summer. The proto I saw was not even finished, no face plate or top. And yea, you could could see those ax7's cookin' inside. Really sounded way good. Put this head with a neo 2X10, and I think you would have a way portable and good sounding rig.