I have B&W 604's up front, with 602's for surrounds. I want to add two center rear surrounds that will go with these (for EX), however I really need to get smaller speakers. Also, due to constraints of the room, these will be pretty close to the main seating position. Lastly, I really don't want to spend too much on these - my guess is they aren't going to get too much of a workout (altho I could be wrong). My receiver is Pioneer VSX-49. Thanks for your suggestions.