I'm getting pretty great tones out of my Z28 2x10 combo. For some tunes though, I'm looking for a more modern and full low end. I was thinking about getting a 1x12 or 2x12 to run the amp into. Most of the time I'm closing micing the amp, and the basically means that the mic is hearing mostly speaker, and not much else. Still, I was wondering what kinds of experience people here have had changing cabs. Is it worth the expense?