I've had this package for about 2 years on a 5.1 set up but due to moving house and my twin boys starting to find their feet I want to move the rears out of harms way. I am looking at replacing the rears with in ceiling speakers. I understand that to "sonically balance" all the speakers should be of the same type or at least the same manufacturer. Can any shed any light on this or suggest a suitable speaker for the Diamond 9.0 HCP package?