Those end chairs do not belong there at all . As for the buffet I kind of like the last teal colored one but that color needs to be somehere else in the space maybe change the drspes to have some of that color there or some different chairs at the ends with that color. And some real art on the wall. too.

The last one may compliment your rug and paint color the best. Easy to decorate around as well. I would recommend a rustic cream table runner to compliment sideboard and add a centrepiece to complete.

Of those, prefer the last one by far.

Budget permitting, of course, you might also consider something like this:

https://vermontwoodsstudios.com/products/large-cherry-china-cabinet-63

or

https://www.wayfair.com/furniture/pdx/darby-home-co-westmont-china-cabinet-daby2108.html

With thrift stores about to reopen, you might find a good used one and paint it black to match your tables and chairs or white to lighten the room.

I found a large 2-door chest similar to the first photo, except dark wood, at a store that sells furniture used by decorators and designers in staged homes. I'm using it for towels and other stuff in my master bath.

You will find "normal" or traditional things at those types of stores and you'll also find some swoon-worthy "different" pieces.

This particular store marked things down every week, until the last week they would be available. I got lucky and got the chest at its lowest price but the fabulous goat hair ottomans didn't last that long.