This is all rather hypothetical, since I don't currently have the funding for this idea (thanks to the job market!), but I'm considering, when I do have the money, buying a Gallien-Krueger MB212 500W combo, then adding a Gallien-Krueger 410MBE 4x10 extension cab to it. I rather like the idea of having a 4 by 10 and a 2 by something bigger. I might just be a little anal, but I'd like the cabs to more or less match, so I wanted to get another GK, roughly the same size and appearance. I don't see a 15 inch cab, so a 2x10 was the best option. It says there's an output for an extension cab on the MB212, and the extension cab can handle the wattage. Is there any reason that this wouldn't work that I'm not seeing for some reason? Thanks! And, of course, if anyone has a rig like this, or one somewhat similar, let me know how you like it! Thanks!