What are your goals for the room performance wise? Adding lots of big speakers might be a dissapointment given all hard surfaces and tile floor. You might want to allow some budget for a room rework. A 14’ ceiling is going to be a reverb chamber without a plan to reduce decay times.
Pop a balloon. Sound like a boing or zing? Start there.
If this was a client install I would be pushing for stereo EP500s for the LFRs and an ultra short throw projector for a 120” image to cover the fireplace. Cover the lower 2/3 of windows with honeycomb blackout blinds to reduce decay times and treat the back wall with a tapestry. Put diffusers on sidewalls.
Keep it simple. This is a problem room with insane decay times. My vote anyways.
