New
#11
The big problem is that these new TV's are all fixed pixel displays. Meaning that a 1080p tv ALWAYS shows exactly 1920 x 1080 pixels. So, when you feel this TV a signal from a DVD...it's getting a 480p image. And then has to take the 480 lines of native resolution and double it to get to 960....and then has to increase it even more to get it to 1080. Of course, when this happens, quality diminishes. Contrasting this to old style CRT's.....they didn't degrade the image as they create the image based on what resolution they are provided and don't have to manipulate it.
So, as you have noticed, when you feed a 1920 x 1080 tv a standard definition signal...it just doesn't look very good. And unfortunately, there is nothing you are going to do to improve it. The picture is only going to be as good as the input signal that you are providing to it. If you want a great picture, you have to provide a great input.
I purchased my first HDTV in 2003. it was a Sony Grand Wega Rear Projection LCD at 50 inches. And it was $3200 back then. It experienced some problems and it was cheaper in 2007 to replace it with a 50" Panasonic Plasma then it was to fix it....as the 720p plasma was only $999. I've also got a 32" Vizio 720p LCD in my bedroom. I guess I'm in the camp that the better picture is worth it. I just try to avoid watching standard def programming these days.