I thought the Spendor D9 suggestion was a good one as well. Anyway, sorry if I just made this harder rather than easier, and best of luck in finding the right speaker.
A +1 on the D9 recommendation.
I think they hit all 5 requirements right on, and specifically 1) to 3).
To my ears they have a beautiful mid-range centric sound (I purchased the D9 after listening to Harbeths) and they also love to boogie...