Speakers with a slightly warm midrange

Hi there. I have a Boulder 866 amp which is very neutral sounding and doesn’t add its own character to the sound. I am looking for speakers that will give the system a musical natural  sound with a rich midrange . 
Listening area is about 14 x 17 foot plus there is a big open space on the left that may catch some bass drift. Can you please suggest speakers that may work. Considering the harbeth shl5, tannoy cheviot, Sonus faber nova 2 and electa amator 3. any others to consider?

thankyou