You have an outstanding system capable of driving a large number of speakers -- the point is to get speakers performing at the level of your electronics.
As you are located in Croatia, I'd suggest you start with EU products first in order to get the best value for money.
Here are some subjective recommendations:
Estelon (from Estonia) makes high resolution speakers with very good frequency response characteristics. I liked the Estelon X diamonds, but they also offer smaller models.
Apertura (France) make excellently balanced speakers with very large real ribbon tweeters, and their sense of timing, dynamics, and reproduction of ambience (live jazz, for example) are exemplary. These are high sensitivity.
Fink audio ("Borg") and Goebel Marquis (from Germany) are superbly engineered products with outstanding dynamics, the Borg is cheaper than the Marquis.
Of course the Kharma (Holland) Exquisite classique is a good all rounder that fits well in your room and looks very good (BTW, so does Estelon - if a bit unusual).
Turning to other choices, Wilson make excellently engineered products. Your room probably needs the Sasha.
Of course there are many choices out there and half the fun is in the auditioning!