IMHO the biggest issue with your setup are the room acoustics. There are a lot of hard surfaces and it is a rather large open space.
May I suggest instead of adding blinds to the two windows on either side of the TV, use floor to ceiling drapes with back out linings; close them when doing critical listening sessions. Move your speakers out a bit wider so they're in front of the windows. This will give you some absorption/ diffusion on the front wall and a wider soundstage for movies. The big factor is the floor. You need a much larger rug, preferably with a thick rug pad. Most interior designers specify a rug large enough so the front feet of sofas and chairs in the seating group to on the rug. Bigger is better. Perhaps move your existing rug to the other seating area group. Next, check out GIK Acoustics or Acoustimac for acoustic panels with printed art work to replace the smallish artwork over the side sofa; this will help with first reflections. Your wife might like the fact that she can choose new drapes, rug and artwork.
Here's a slightly more extensive issue; remove the marble slab behind the TV and possible replace with a diffusion panel from GIK Acoustics. They make some contemporary style panels that would integrate well with your decor. Luckily your main seating sofa is open to the Kitchen behind, which is to your advantage as far as room reflections.
Lastly, (sorry for the long winded response) look for speakers with soft dome tweeters, stay away from horn speakers in your environment.