Im trying to understand where cables make a difference. My HD digital cable comes through coxial. Where do i have to use DVI/HDMI or component cables to give the best quality picture? Same question with sound? Where does optical/digital/rca make the difference? If I had satellite HD programming would i have to run HDMI or equivellant from the satellite through the house to keep the best quality. And finally, how much of a difference does DVI/HDMI make over component or over composite? Same for audio, how does optical compare to digitial/coxial and rca/composite?