I'm using Qs4's in my HT setup, with Vp150 center, M22's as fronts, and Ep175 sub. My room is 13 x 15 and the Qs4's sound great, and is more than enough for the room size, I think the Qs8's would be a overkill and a waiste of extra money.I feel the same about Ep350 sub vs Ep175 for the room size, would be a overkill. Well thats my viewpoint, hope it helps.