We just moved and I'm not able to use my BS21s for my rear surround due to room configuration. I'm using two FS51s and a C21 Center. I'm going to have to buy some small satellite speakers to use for my rear surround since they will have to be mounted on the wall due to the room configuration. I'm looking for a recommendation as to what might match the timbre of these other Pio's that I already have. Any suggestions?