Guys, you're doing my head in.

It's as if there is the golden rule here that the formula big amp head plus a quality 4x12" cab is the pinnacle of tone and feel.
Playing live that's simply not true! Let's try to find a board member here who has actually cranked an amp over a 4x12" in a live situation! We might find one, maybe two... The truth is that there is simply no place for 4x12" cabs on today's stages anymore, they are highly deficient in terms of volume, signal bleed and use of space.
The bleed from the speakers, the big variances in micing the cab in different venues, the resonance of the stage floor and the room... it all makes for highly unreliable live situations and, usually, the player doesn't get the sound he/she loves from playing at home or from - tadaah! - the records he/she loves! I've been to far too many semi-pro/amateur concerts with too loud/overgained amplifiers on stage resulting in a horrible sound for the audience and/or inaudible guitars.
I see a couple of future solutions for guitarists:
- a AXE FX or Kemper straight into the PA
- a small amp with a 1x12" cab/speaker, close miced into the PA
- an amp via a load box straight into the PA
It's no wonder more and more pros are switching over to AXEs and Kempers.