Speaker efficiency won't be too much a problem since you are getting speakers FIRST and a power amp afterwards to fit. In light of that, I highly recommend you try Dynaudio they make probably the best monitors around. If WAV is important, try out Special 25's (87dB) with gorgeous birsch finish, also you can consider 1.3SE (86dB) or the new 1.4S. If you don't care too much about looks, consider Dyn's pro version of the 1.3SE -- BM6 which can be got online brand new for $800 shipped!
Try audition Dynaudio at dealers if possible.
Try audition Dynaudio at dealers if possible.