Okay that's fair enough. The PCI tuner you linked looks interesting to me. What software would you use for managing the record schedule and for playback?
MythTV.
But the problem is that you'll need small frontends, and those guys suggest Mac Minis (because they actually use less power than Atom PCs when playing recordings). However, they apparently didn't get the memo yet that there are ARM-based $50 Android/SmartTV "HDMI sticks" that are capable of playing 720p HDTV, run GNU/Linux and are perfect for that purpose. Maybe in 2014.
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