I want to add a centre speaker to my system to play back Dolby 6.1. I curently have Mission 73 Fronts, M7DS rears and M7C1 centre. I am advised that another bipolar M7DS would not be ideal as a rear centre and that I should be looking at a directional speaker. Can anyone suggest a suitable speaker which will match my missions tonally, would be small enough to mount on the wall and look good visually with the M7DS's?? You would think it would make sense for the likes of Mission to produce a dedicated rear centre which could be purchased as an upgrade. Any advice greatly received.