Hi. We just purchased the new HD Tivo to replace a Series 1 that we had in our den. The series 1 has been hooked up to an HD TV, rigged so it will record on the basic cable channels, but not HD. We were so excited to see the price drop, though I'm a little concerned about only 20 hours. Anyway, I have a question about cable cards for the new HD TIVO. My husband seems to think that we won't need them because he thinks our TV already has them? Is that a possibility? We have Comcast Cable, with an HD box. We also have a DVD and XBOX hooked up to our 42" HDTV. Any advice would be appreciated. Although I'm an experienced TIVO user, I'm a newbie to HD. Thanks!