Your comment on the Subway 12 is intriguing and I have heard it before. Without wishing to sidetrack this thread, how do you find it compares tonally to the Barefaced and AudioKinesis?
This is comparing the Barefaced Super Midget, which is the closest to the Mesa in price and design (12" with tweeter). The Mesa has more going on in the low mids and is a little deeper sounding (remember, it's bigger). The Mesa is a little more versatile due to the tweeter level control. The Barefaced tweeter control is a crossover, not a level control. Overall the Mesa sounds bigger. The beauty of the Super Midget is the tiny size and light weight. It's much smaller than the Mesa and weighs about 7 pounds less. The Barefaced takes EQ very well though so you can dial in about anything you want, but the Mesa still has the better tweeter.
My AudioKinesis is the Changeling 112t which has front and rear firing mid drivers instead of tweeters. Overall the AudioKinesis is my favorite sounding 12" cab. My favorite cab overall is the Mesa Subway 15 because of the clarity and articulation, especially in the mids. The AK is voiced more like the Subway 115. Deep, clear, articulate. No need for a tweeter, those paper cone mids are incredible. The AK goes deeper than any of the other 12" cabs, but the tradeoff is volume. It's not as efficient as the others so it needs more power. My opinion is also that the AK is the best design for a 12"..tall and skinny with a recessed handle on top. Pick it up and go.