I have a HD CRT TV and an LCD. The CRT gives a great picture but it is subject to burn in like a plasma. To protect the TV I stretch or zoom the picture on SD broadcasts but this causes distortion and a lower quality picture with parts of it cutoff and believe me I don't want a lower quality picture on a TV that already shows all the defects in a SD broadcast.
With the LCD I can leave the SD picture in it's 4x3 format, enjoy a better picture and not worry. To me LCD is the best until something like SED comes along but even this has burn in.
http://en.wikipedia.org/wiki/Surface...mitter_display