We are about to buy a new TV and of course we want to begin incorporating HDTV. We have a multi-brand home theater system with a Sony receiver as its center. Our reception is through Dish Network. My question is, what equipment in a home theater system needs to be "HDTV capable?" Do I need an HDTV satellite receiver, HDTV home theater receiver, and an HDTV television? Will I still have to have a separate HDTV box? (I don't plan on buying a television with it built in, just in case the standards change.) Thanks ahead of time for your help.