I am about to embark on my next upgrade journey

Room correction. I recently added a McIntosh Men220 room correction unit to my system. It dramatically changed the sound for the better. I may do a full on report if anyone is interested. But, one of the big things it did was to align all of the phase and frequencies between my speakers and subwoofers. It adjusted phase and crossover frequencies, making all of my speakers work together. It was also a hit in the WAF, (wife appreciation factor) as my wife can decorate without multiple room acoustic treatments all over the room. 

I would definitely recommend auditioning the Borresen X-Series the X1 starts at $5,500 US and even the X2 is only $8,800 and the X3 is $11,000 and they punch way above their price range phenomenal sounding speakers.

Have you considered the Magnepans LRS + ?  You have the room to pull them out from the wall and you also have to subs to help with the low Hz A good amp to drive them would be the Orchard Audio Starkrimson Stereo GaN Ultra DMC 2.0  250watts@8ohm & 500watts@4ohm  

Picking up on the comments of @jfrmusic I have a pair of Spendor A6R's for sale over the other U.S. Mart that you may want to consider. They are not stand mount but occupy about the same space. They feature a transmission line cabinet and are known for their glorious mids. Paired with your subs, they would be worthy of consideration. The money you save could go toward that streamer, or a new amp or whatever that next upgrade is.

I was going to recommend the Alta Alyssa speakers but they are a 4ohm 87db efficient speaker.  They probably wouldn't require a sub based on their low frequency extension.  Good luck.