I agree with the guys who have said that if you want set it and forget it, the Triaxis and the JMP are probably overkill programming-wise. I used to have MIDI controlled gear with space to store 100s of patches and found out that I only used 3 or 4 basic preamp sounds and changed some of the effects. Often I would get "option anxiety" programming sounds, "if I tweak this parameter, then this one, oops back to this one, now add this, that's cool save it, now if I do this..." and decided I was doing too much programming and not enough playing.
So, I went back to a head, it's a stereo head with 2 60W TUBE power sections and the preamp has alot of tonal options so I have a setup that really works for me. It's basically the same as a 2-3 channel preamp and tube power amp in the same box. I've thought about going back to rack stuff, but if I did it would have the same results, I would probably use a CAE, Soldano or Triple Giant pre (if I could find one) and a tube power amp with an effects unit in between. I would probably look for a Rocktron Multi-Valve or Replifex for effects 'cause you can program them to do you channel switching with patch changes. I would still use my pedals in front too, can't live without a real wah, DS-1 or SD-1, volume pedal and the occassional dash of Phase 100.
Having said that, the ultimate rack unit to me would be a rackmount Soldano SLO, sure it's mono but the tone (if you are a Soldano kinda guy).
Of course, if you are a total Mesa guy, the Triaxis may be the only one that gives you the most important thing, the sound you are looking for.
$0.02 more,
Roger