I've been considering buying an extra cab to pair with my 300T and 215, but I'm not sure which route I want to take. I *REALLY* liked the sound that I got from my 1x12 Fender BXR-60. It wasn't necessarily the tone, just the output of the speaker. It had that midrange punch but also the low end rumble with nice, clear highs. What I'm afraid of by adding 1 or 2 12's to my 2x15's would be that I would have ENTIRELY too much lows and it would end up being muddy. What does everybody think? Would I be better off going the 2x10 route or the 1 or 2x12 route? Any experiences along these lines??