Is the only difference that you don't have to have a box? What is the price difference? I'm thinking of getting a Series3 and have an HDTV with Cable Card support and want to know what I should do. I also heard something about it needing two Cable Cards...I'm not sure if I have two slots. Can someone clear this up for me please? Thanks. I have Comcast for the record and I'm currently using an HD Cable Box. EDIT: I also heard using a Cable Card you can't get On Demand or order movies via your cable provider, is this true? If so, that sucks.