Coincident Invictus at $3k USD should be a great choice for a stand-mounted monitor if you intend to keep it for a long time. You're paying for a very high-quality speaker with Coincident. I've kept my small Partial Eclipse for a couple of decades, now.
If you are thinking this might be an interim speaker for a few years, consider a Tekton Design Lore Reference ($800). The cabinets are not fancy, but they have a small footprint, high efficiency, and are an easy drive for an 8 watt amp. And they are way better than their price suggests. I gave my pair to my son-in-law to use with a Coincident Dynamo 34SE (6 wpc) in a room much larger than yours, and it works spectacularly.

