Re: Full stacks, half stacks, combos, ect...
The simple answer is that there is no right nor wrong. You should use what's right for you.
I grew up playing through half stacks, then went with 2 4x12's side by side. The fullness of the sound that way is killer, but I'd always have to turn up louder than I should be, in order to hear myself.
Last year I started using a stack, which was cool cause I could have a lower stage volume, yet hear myself better. That band was more of a disco / R&B thing, so I didn't really need a huge "wall of sound" tone. Not my cup of tea, but between it and my other gigs I was playing 325 paying gigs a year, so who could complain? Turns out, I did, so I left that band at the end of the year.
Now I'm playing with a more Classic rock type band, and recently I've gone to using 2 Marshall full stacks. I'm getting the best of both worlds. I'm getting the fullness of 2 4x12's on the bottom, as well as being able to hear myself without being overly loud.
I know that some who read this will think I'm being ridiculous for using all that stuff, and I've gotten some flack from people around here (fellow guitarists) who think I'm being pretentious by using such a big rig. The truth is, I do it because I love how it sounds, and my playing has improved because of it. To be truthful, before going to this rig, gigs where I really dug how I've sounded on stage have been very rare (I've been playing professionally since 1987 - quickly approaching geezer-dom). And I like the way it looks! I do it for me, not to impress anyone else. And besides, I'm the one lugging it around and hefting it all onto stages. But, some people are incapable of understanding "different strokes for different folks". Some people don't wanna load in a lot of gear cause they're of the "get in, get paid and get out" mentality. Not me. I play for me. I want to get off on my sound. If this is what it takes for me to get off on it, so be it.
Of course, the down side of it is having to lug it all around, not to mention needing a vehicle large enough to haul it all around. But the sound I get is worth it. Oh yeah, it's more than worth it.
So be true to you. Use what you want. After all, it's your sound.