I totally confess my ignorance here. If one has HDTV do you need to pay the Cable Company (Time Warner here in Chatsworth, CA) extra money to receive broadcasts in HDTV? What percent of TV shows are broadcast in HDTV- rough guess? Are all sports events (NFL, NBA, college hoops and football) broadcast in HDTV? Can old movies be broadcast in HDTV, such as black and white & will I notice a difference?