To the OP this might help your decision. Just exactly what kind of music do you listen to?
I hear guys talk about the SQ of a sub and all they listen to is knew rap that sounds like *** on ANY sub.
I've listend to blues, jazz, rock, metal, classical, you name it other then country and the AQ's play it all very well as does the Q. And the Q will get respectably loud, but the AQ with enough power will get much louder and have way more impact.
I've had guys complain about my system not sounding loud enough because the bass is so clean, even at full volume...