Why would you need to spend $850 on a rear centre surround? If one was to have a lot of extra cash I could see having all 6 speakers in the system the same; for timbre equalization. BUT if money is an issue; a less expensive route for the surrounds is adequate (although I would keep the front center equivalent to the front mains; in my system my 3 fronts are the same). I noticed a fuller rear surround sound by adding the rear centre. But is it worth $850? All depends upon how far your money goes.