Help with high end bookshelf speakers

Hegel with the Borresen X-1's ( $5500 pr.) Best Match.

Well, given budget limit of 5K, I would encourage you to research Fritz speakers. You have been given a couple references  for these speakers herein making mine the 3rd. I own the Carbon 7 SE MKII. They sell for $2800 and sold manufacturer direct with a trial period. Ones cost to try a pair is return shipping. They would play well in your small room, are easy to drive, and represent great value in speaker cost. Mine are paired with higher cost amplification. Fritz has a great website and is easy to talk to regarding your musical tastes and needs. 

Years back, I was banished to a room in my basement for listening.  I was a little disappointed until I set up the room.  It was definitely a blessing to have a room that I could set up however I wanted.  My room is a bit larger than yours at 18x14.  I used the Wilson protocol for speaker placement and my ProAc R2 speakers absolutely disappear.   Good luck.