But don't you already have two Athena center channels, one being used for the rear center?
Reciever: Yamaha RX-V1500
2x Athena AS-B2
2x Athena AS-C1
2x Athena AS-R1
2x Athena Sub8
2x Sinclair 140 (these are 2 small surrounds I currently have, I have just purchased the AS-R1 for 89.95 each)