Been researching tvs and narrowed the search to a Samsung pn513530 or Panasonic TC-P50u50. I don't really care about connectivity or 3d-or should I? My question is with either tv, is there a difference in pic quality stepping up to the basic 3d models of either one? I'm talking about regular tv picture, not 3d picture. Or, to put it another way, are the screens on the 3d models the same except they have the capability to show 3d?