Speakers known for great midrange.

“Fill us in on how you like them!”

Will do. 

A bit late to the party, but the best mid-range I've heard from a pair of bookshelves is from Q Acoustic Model 300. Extremely silky and smooth. It's just too bad the speakers are lacking in other aspects like dynamics. The rolled-off highs and bass are also too big of a compromise for me. 

I am perfectly happy with my current pair of speakers Cabasse Riga. I've upgraded from Triangle Comete 40th which is very well-known for their fantastic mid-range as well. I guess you do need to audition the speakers because each person might have different definition of what sounds good for mid-range. I prefer my mid-range to sound more natural rather than colored. 

With this budget hunt for

Acapella Monostatos or

one level better the Harlekins.

MK1 Version of both completely

enough. 91dB/1W/1m each.

I use them for years now in my two systems, home cinema and music.

Difficult to find.

Good luck.