I have a Shuttle 6.0 and the 112 cab that came with it. I want to run it with two cabs...at 600 watts. I want a little more headroom, fullness, and volume. I was thinking about purchasing another one of these Shuttle 112's like the one that came with it and just run the twin 112's. Where can I purchase another one of these online? They don't seem to carry them at AMS which is where I usually buy my gear because I like the 3 pay and 5 pay options they give me. Also...should I instead consider buying a 2X12 or 2x10 cab and run the 1x12 alongside a 2x12 or whatever. Finally, should I just buy a GB neox 2x12 cab and just run that by itself? Will that single 2x12 cab give me more volume and headroom than my current 1x12? I'd still be running the same wattage correct? So I don't see me getting the benefits I'm seeking by running only one cab. It seems to me I'll need to run my amp at 600 watts(two cabs). So the question is...which combination of cabs?...and where to buy online?