I've had a full stack in my living room, but never gigged it. WAAAAAAAY too much for a pub band in both size and image. You look like a small c*cked w*anker.
In 'DC I use a half stack, and in Doppelganger a 2x12. I could gig a 2x12 with 'DC quite happily and have no problem with sound. The only way I would use a full stack in the future would be if a) I could justify the expense and b) I was playing stadiums. There's no reason to have one otherwise. So I won't be having one.
Another importatnt thing to think about is the ohm ratings of cabs. In a full stack, you need to run your amp at 8 ohms (if you're running two 16 ohm cabs). I prefer the sound of my amps running at 16ohms so a signle 4x12 or 2x12 sounds better to me.
Having said all that. a full stack is something you have to play through at least once in your life though.........