A good rule of thumb to use when moving up in size is to buy as big a tv as you can afford. It only seems "large" for the first week or so. My sitting distance to my 65" is about 12'. It seemed enourmous for a week or two. Now I want a 73". Also, although the 42" is only 5" bigger, it provides about a 20% (ballpark) increase in overall screen size.