Am leaning towards a Sony KDF55WF655 with HD tuner. My question is this: With my theatre set-up, the only cable running to my current TV is video from my receiver. Will the HD channels from my cable provider be detected or does the coax need to be directly connected to the TV? Sorry if this is in the wrong place but I put it here b/c of the Sony reference. A little bit more about my current setup. Coax--> STB (non HD or digital yet)--->TIVO via RCA---->DVD Recorder and Receiver via RCA----->video to TV. All audio to speakers. Will I benefit from the HD tuner with this set-up?