I am considering purchasing a second HDTV for the basement as well as getting a Comcast HD STB which brings several questions. What signal format does the box put out on SD as well as HD - is it 480i,480p or ?? I am looking at a Sony KP-43HT 4:3 RPTV but I have noticed that the picture from standard cable sources is fairly poor in quality. Since most viewing is standard cable on this set, image quality fro these sources is important. On DVD or HD signals this set's picture is very good in the 16:9 mode. Any help or insight would be greatly appreciated.