Thinking of getting HBO for the new season of Sopranos and will have to get digital cable for this. What benefits does if offer over regular cable. I would imgaine sound and picture to be improved but is this really the case? Also, according to my cable company, I would have to get the HD service for 5.1 audio which suprissed me, I thought that was part of having digital cable. FWIW, my TV is not HD, just a 36 inch Sharp CRT. I do have quality audio components so if there is improvent in sound quality than I would be able to hear it (at least I think I should be able to).