When watching 4:3 digital over-the-air material on my 16:9 Sony XBR800, some stations broadcast black bars on the sides and others broadcast gray. When stopping a DVD on my Denon DVD-1600, the screen-saver is plain blue. Just wondering what color is considered best in terms of preventing burn-in on CRT based TV's ??? And should I be concerned about leaving the Denon's blue screen-saver background on for 10 or more minutes at a time ?