Windows Media Center - Which TV tuner adapter?

I currently have Direct TV with Tivo. I understand that Windows Media Center does not work with Direct TV.

What I really would like to do is give cable / satellite altogether and just record over the air using WMC. Believe it or not, I don't yet have and kind of HD receiver so I have no idea what kind of reception I will get.

I would like to start small and just buy a 2 tuner card. But I would like to have a backup plan and move to cable (Vios) should my reception be poor.

I see there are "cablecard" tuners. I understand I will need one to record from cable. Do any of the cablecards also record over the air broadcasts?

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