Sweet system. With those Avalons set up well, with the right room and treatments, all the right gear, you should never need a center channel or rear channels. They can throw a giant sound field that is just enormous. It will totally envelope you and sound will come from all over. Like you are in a giant sound bubble and in the world where the sound was recorded. I'm sure it sounds awesome now, but what they are capable of is unreal when totally dialed in. Those drivers are also big enough with the right gear and amps to never need subs. Save the space and spend the money on getting those Avalons dialed in perfect instead :)