I voted for the first chair because I have a cat. The open-arm chairs would be less comfy for him when he sits beside me -- he'd fall off!

Something with softer lines to soften up all the squarish pieces.

What are you going to do to blend the fireplace in with the furniture style?

Rug is fine add lucite coffee table.

I voted for the 2nd one because I like the chair, and how it would balance the chrome trim with the white pieces it will be flanking the fireplace with.

I voted for the last chair, I'd like to see the wood repeated on that side of the room. And the shape of those arm rests/leg is beautiful. I'd paint the fireplace black or charcoal.

Very cool room and the rug is perfect! I think you need a pair of chairs. Otherwise everything is a single element

Would you be open to painting walls revere pewter from BM and then paint FP white. That will pull it all together.

Once you find a chair (s). You can find coffee table.

Thanks for the suggestions so far-very helpful. @Carolins-wow-how did you do that? Definitely makes me see I like the Charcoal better than white.

@laurak-I definitely need to paint and that's a great color suggestion. The pair of chairs concept is what's been nagging at me accept I don't want another white leather Barcelona chair but I do like how the one looks in that corner w that lamp. Hmmmmm...

I'd keep the Barcelona chair-- by itself it's a treasure. Maybe something like two of these
http://houzz.com/photos/562461

Honestly, I didn't vote because I wasn't struck by any of the choices. I think the chair should follow the color, at least, if not the lines, of the Barcelona, which is beautiful in its spot. How much space do you really have there for the second chair without interfering with the hall traffic? Maybe a Mingo with white nubby upholstery? Or something like it? The arms would make your husband happier, but not so big a presence. It doesn't look to me like there is really room for a second Barcelona and footstool, but maybe it's the photo angles. I love, love your rug. I'd think a long time before painting the fireplace. I'd change out the decorations first for something more mcm, and see how I felt about it.

Were there any that had lines similar to your couch? I think it would have a calming effect to repeat the lines. Couch is beautiful but it looks lonely! Just because it's MCM doesn't mean it's the right thing for your room.

Love the Barcelona Chair!

I think yes to a coffee table and maybe add some printed cushions similar to the cushion in the picture below to lift the Sofa. If you get the print and colours right it will help pull the room together.

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I would not paint the fireplace as suggested. I would find a side table (or something else) that has similar colors as the fireplace to tie it in. Painted fireplaces will be out of style in no time and everyone will be kicking themselves when they decide it is time to remove the paint. and it doesn't really go with the mid century look.