Dining Room / Living Room Project

My redecorating project is coming together very slowly... I am working on my Dining -Living Room of my townhouse now. It is small, but it works for me. The layout is a little challenging considering the location of the door and the fireplace. 

I recently purchased this dining room table to go with the upholstered chairs I posted earlier.  This table is from Better Homes & Gardens.

I'd like to hang a large mirror on the back wall behind the table - the room is small and I think place the mirror there should make the room look larger. Here are a few I spotted in my search:

I like the round mirrors, but a square mirror may better balance out the round table. What do you think?

Lexington Zacara Jet Floor Mirror - but I LOVE the chairs more.