There are a few incredible products in that price range, even at the lower end of your budget.
The Revel Performa3 F208. This is an older speaker but is awesome sounding and because it is made in Malaysia, it is a killer value and at $5500 is at the lower end of your budget. It will do okay with your existing gear and will leave you money to re-invest in some of the equipment...better amp/DAC/streamer
At a higher price point you could look at the Scansonic MB5 B. It is a bigger sounding speaker with a ribbon tweeter. They build a big soundstage with a large dispersion pattern. It is a brilliant speaker that is very engaging. It is a bit warmer in its tonal profile.
I would also look at the Monitor Audio Gold 300. Wonderful tweeter and brilliant drivers. They are warmer than you would think for an AMT. very natural sounding and are sort of a middle ground between the Revels and Scansonics.
I am a dealer for scansonic. I have no association with Revel or Monitor Audio