I really like the first two you chose but am not a fan of the third, for your table. The Restoration Hardware ones would bring your table into current times while the Dot & Bo's would keep it firmly grounded in mid-century. Depends on which of those thigs you're looking to accomplish but great start!

I guess the easiest way to update would be to paint it another color. I like your first two chair choices too.

I like the second of the three, but only if the color works with your set. Here are other ideas, which just may mix you up more! I think leaning towards mid-century vs industrial may be a better choice.

If the set isn't painted already leave the wood alone. As for chairs, the woods don't have to match as long as the style and the scale fit the piece.

Personally, I think the RH chair would be uncomfortable. The other two are sort of Meh.

Take a look at some chairs at allmodern.com

The Cork Parsons chair is covered the fabric, and is a nice blend of mid-century and contemporary. Great price, too.

There are a few Parsons style chairs on their site. Double check the scale.

I like a fabric covered chair. It will warm up the set.