I think that your SD feed might actually degrade a bit. When we had our old analog box, the SD channels looked a bit better PQ wise. We upgraded to a new HD box, and the PQ of the analog channels got a tad worse. Again, got upgraded to ANOTHER box, and the PQ dropped again on SD channels. Recently had a firmware update which fixed it a bit, and now I'm just waiting for the next STB to come out. Hopefully it'll help out with the SD signal.
Some people work around this issue by having their SD channels feed through their composite, with HD through component or DVI. The composite can smooth out, or soften the SD signal, allowing it to look a little nicer.
The boxes I'm referring to are Motorola cable boxes, you might want to check in the HDTV hardware section to see if you can get feedback specific to your sat box.
The Dish 6000 will not improve nor degrade SD channels over say the 4000 non-HD receiver (mothballed the 4000 when I got the 6000 about 4 yrs ago).
However any time you increase the size of your monitor, you will notice all the "warts" due to compression that is used to squeeze more channels on a sat. transponder.....same with Directv, though I think they use a different compression algorithm.
Earlier monitors, using the component input, would not allow you to zoom the SD picture to fill screen, not sure about the panny 7uy. You had to use the composite or s-video input. Unless you are going to subscribe to the HD channels, the 6000 would not be of any use (other than local HD stations, if you have any in your area). Suggest you look at Bruzzi's panny comparison thread ( http://www.avsforum.com/avs-vb/showt...hreadid=407154 ).
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