I've been going back and forth on adding a 2nd cab to my rig. I have an EBS Fafner and an EBS 4x10, so I'm sure I'm staying with EBS, if I get another cab. Anyway, I was originally thinking about adding a 2x12, with the expectation I can coax "throatier" lows out of the rig, while working the head a bit harder. However, someone mentioned to me that I'm better off getting another 4x10 because it'll match with my current 4x10 better. The other alternative is that I go with the full 15" cab, though I'm generally not a huge fan of 15's... The ultimate downside is that I can't a/b the two different setups. Any thoughts?