I've added the logitech ue 6000 & 9000 to the list. According to innerfidelity these have an excellent sound quality, excellent as in better than the akg k550! That is without the noise canceling on, with it, it has a bit of a bass boost. Which is something I really need on the bus, or other loud places.
The UE 9000 comes with a bluetooth function, and when listened to wireless, it sounds pretty much the same as when listened to wired.
The UE 9000 & 6000 are said to have the same SQ, so the extra 100-150$ is just for the bleutooth function.