hi all I am About to purchase a wharfedale EVO setup EVO 30 - front EVO 8 Bookshelfs - Rear EVO Center - front center and EVO sub. What should I use as a rear center? Should I get another set of EVO 8s and use one of them or should I use another EVO center ? What will sound better is what im after! Im using a sony STR-DB1080 Amp. Thanks. PS can you get a Rear Center specific speaker?