I think you have a nice idea with gray but keep it light, and try to stay true to the color, it could go blue or purple on you. Going in the greige/beige direction might keep your walls light and complement your furniture. Get some samples and try them out prior to dedicating yourself. Good luck!

Sw repose gray is nice and warm and not too dark. I kind of like an off white with the color tones you have, like Zurich white or bm classic gray.

Unless you are planning to change out the floor and furniture I would steer clear of gray.

I agree with Designer Drains.

But if you are going to do a gray you need to stick with a "Griege" color that has a warm tone to it opposed to cooler.