The only reason I'd even consider going with 4 towers is if a very significant portion of your overall listening is to discrete multi-channel audio (SACD/DVDA). Even then, using some sophisticated bass management (like an Outlaw ICBM) would negate much of the advantage. The QS8's are just super, and are going to be easier to place for good movie surround. QS8's and EP500 in a heartbeat.

bibere usque ad hilaritatem