Looking for new speakers for large audio room

Dutch and Dutch 8C. Half of that price range but will beat most. 

But you seem to be just right for Grimm LS1be. Those are endgame speakers. 
https://www.grimmaudio.com/hifi-products/loudspeakers/ls1be/

Time to outgrow all the puerile preamp, DAC, amp banter. 

@shawarma
In your large space, are you satisfied with the Avantgarde uno sound with the exception of bass impact?

You really should keep those wonderful speakers and only add what your room is missing which is several subwoofers to properly pressurise that large of a room.  Most any new speakers you might purchase would still need those subwoofers due to the room size.  My main listening room is that large and I wasted time and money upgrading to larger speakers when in the end several subwoofers were the only thing that could properly pressurise my room.  Wishing you the best.

For that big a room, Klipschorns, Lascalas, Cornwalls, ...take your pick.....

@atmasphere yes I’m only working with dealers that already have the speakers in stock do to custom officers raising the tax to 200% or more of the speaker price so I’m incredibly limited to what speakers I’m looking for