I have Mission 773e front speakers, and 77DS rear surrounds connected to a Pioneer VSX-D2011 AV amp. I was planning on getting a matching Mission 77C1 for the centre channel. However, I've been trying to get one from Richer Sounds for the past 5 months without any luck. I've basically given up hope of getting one now since they seem to be no longer available, and need advice on what my next best option would be. I'm not interested in aesthetics or size - my ONLY concern is the sound quality of the important dialogue channel, and matching the tone of the other speakers. I'm thinking of the M7C1, M7C2 and M5C, and would appreciate some advice on which of these (or any other speaker) would make the best centre speaker?