Can you post a picture so we can see what you currently have in the room?

I would stick with a wood tone and let the chairs and chandelier be the stars.

What about simply putting a marble top on the existing table under the window? Or do you need storage space?

I am never a fan of matching the buffet to the dining table. Too boring, not interesting. In your case, I would do a mirrored buffet.

I don't love the console from Wayfair for your space. I would go with an antique white, simple, classic.

Out of curiosity, what is the size/measurement of your dining room?