Speaker Help Please: Floorstanders around $1Ok to fill very large space with no sub

My living room is about the same size. Highly recommend either the Magnepan 3.7i or the 2.7x - both inside $10k. He needs a large speaker to fill that space and provide the soundstage.

And the Lyngdorf TDAI -3400 amp. 400w per channel into 4 ohms. Superb! It has ‘Room Perfect’ to tweak the sound for room acoustics. Will make a big difference with that slanted ceiling. Made in Denmark. I’ve had that amp for 5 years with the 2.7x - fantastic. I have subs, but don’t want to mess with the Maggies low end. 
 

Happy hunting!

A bunch have already been mentioned, but I'd look here

MoFi SourcePoint V10 Master Edition $8,000

Arendal 1528 Tower 8 $12,500 or Monitor 8s $6,800

Fyne Classic 12s OR 703s OR 702SPs - Used under $10,000

Volti Luceras used under $10,000

Pure Audio Projects Trio 15s $8,500

Revel Salon 2s (Sometimes under $10,000

ProAC Response D80

ProAc Response D100

Response 4. All 3 used floordtanders

Legacy Audio Focus 

Another vote for Legacy Focus SE.  You won't find a better full range speaker around $10.5K.  These are incredible speakers. Check them out!