Looking for suggestions on what screen size I should get and debating size vs picture quality. Our Den is long and narrow and the couch is L shaped. I presently have a 40 inch set. If you sit on the long part of the couch the distance to the TV is only 4 feet. The 55 inch sets would be to large so I was considering the Samsung 46F8000, Samsung 50F6800 or W802 47" Sony. I know I am different ends of the spectrum regarding quality.