Best Speaker For 14' Separation & Placed Near Wall

Hello,
My Listening Room is configured in a 20'x20' room with a pretty high ceiling. Several "built-ins" exist along the speaker wall; such as, fireplace, TV, doorway, etc. This completely restricts where I can place the speakers.

Therefore, the speakers are placed exactly 14' apart, 1' from the right side wall and pretty much open into the front foyer on the left side. Furthermore, the speaker wall acts as a walkway into another room, so the speakers cannot be pulled into the room more than about 1' from the rear wall. Not ideal, but workable.

Fortunately my listening position is 14' from the speakers. I wanted to know which speakers would work best with such a wide separation distance WITHOUT losing the soundstage and being able to identify each speaker? No budget for the speaker, but something around $7K+ or so, on the used market. An amp upgrade from my Classe 301 will also be done at this time. Recommendations???