I have a room that is 21x14x8 and I have (4) M80ti and I am using them for HT, SACD & DVD-A and they rock. I don't think they are overkill and my room isn't that large. I think overkill is in the eyes of the beholder.

Axiom M80Ti(4) Axiom VP150(1) Axiom Qs8(4) Axiom M22ti(2) Axiom M3ti(2)