Hello, I have the older Boston Acoustics 555's for my fronts & center and the 575's for my surround. I recently upgraded to a 7.1 and got a pair of BA HD8's for my back. I would like change my center speaker out and move it to the back, assuming I can find another 555 to go with it. Would a BA 910 be a good match with the 555's and 575's. Thanks for your help.