The Toshibas with the "X" in the model name are from their "cinema series". I don't know how much better they are than the similar non-cinema model (e.g. the 43HX71 and the 43H71) but they're more expensive. See www.toshiba.com/tacp/tv/cinema.html and www.toshiba.com/tacp/tv/fstpure.html to...