I have 2 Series 2 Tivo's connected to 2 non-HD TV's in the house. On my 3 HD TV's, I have the crappy Comcast DVR. My wife has been begging me to toss the Comcast DVR's for TiVo with HD. Anyone use the TiVo HD? anyone use the TiVo HD with Comcast Service? I think I have to get a CableCard from Comcast? Thanks.