I have a pair of Harbeth 30.2s in a room about the same size as yours. I use a Line Magnetic Premium 845 amp. The bass is silly good for a stand mount speaker. I took a pair of nice subs (Axiom EP500s) out of the system. Didn't need them. The midrange? Right up there with the best I've ever heard.
Excel Audio, in Newport Beach also carries the 40.2s. Wow! They sound beautiful, but they are physically too big for my room. But, still, I'm thinking about it.