If your a LOTR rings fan, you should definitely buy a pair of M2's for the rears. Both movies have incredible DTS ES soundtracks. There is a lot of rear surround info in almost every scene of each movie, but especially the action scenes. Since you already have the amp for it, there is little reason not to spend $255 on a pair of M2's.

I actually only have 6.1 because that is all my amp can do, and so I have 3 Qs8's. I love the way it sounds and am very happy with most movies in 6.1.