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Ceton makes the infiniTV which works with a windows 7 PC.  It has 4 tuners and takes a multistream cablecard.  This makes for a nice all in one solution.  This needs a pci-e 1x slot

On the other hand there is the HDhomerunprime.  Which accepts a cablecard and pumps the signal over ethernet to a wwindows media center PC (use win7, win8 is still in beta).

I use the Ceton, it's fantastic, it was a nightmare to set up with Cablevision and every tech they send out has no idea how to use a cable card.  You don't have to pay monthly except to rent the cablecard, which for me is $2.  

Be sure you give the cable cards enough horsepower (fast processor) because it's a very demanding process on the processor (at least watching over your LAN to media extenders (xbox 360s).

So I pay for one cable card, and have 360s wired throughout the house.  I love the set up and works fantastically, as long as you're ready for a long set up process because no cable worker knows how to set up a cablecard.

Also thanks for the GFL series, pretty awesome stuff!

Or pony up for a TiVo, but that's basically just getting the box from the cable company and paying elseware and still not getting on demand stuff.