just got my new lcd 30" sceptre naga III. gorgeous dvd playback via rgb. however, i'm using an old dish network recevier. with the tv's built-in line doubler the standard definition picture looks rather soft and unfocused. i can try a dish 811 with dvi or progressive scan, or i can try a dvdo line doubler/scaler. is there going to be any significant improvement with non high-definition material? thanks