said by b10010011:Yeah, there are PC tuner cards that can use a cable card and they would allow your PC to receive every channel a set top box does.
Bu they are only single tuner cards, so like in the picture you would need multiple cards to record multiple channels at the same time
So in reality a lifetime subscribed TiVo-HD is a more cost effective solution than a media center PC for a DVR.
I personally prefer TiVo, but with the Ceton card, it will have two, four or six tuners. It will only need one multi stream cable card and will have one cable input that will split internally to all the tuners.