I'm in the same situation with a similar size room I am looking at doing. I'm planning on the narrow config, so that everyone is straight on looking at the screen (doing front projector). I haven't looked into seating yet, as we are still getting estimates and finalizing the exact layout of the floorplan. It's possible some of the seating will be what we used to use in the family room, which got slip covered and put in the living room when we moved, although that would mean new living room furniture that would never (almost) get used. We have a sofa and loveseat in there now, and they are super comfortable. Recliner seating is another option we'll look at too though.
