TV Tuner? DVR Software? Media Center?

I was just wondering about this whole TV Tuner/DVR subject.

I have an MSI 845 Ultra (Ver1) MoBo, which is already 8 years old (Running XP Pro), but it still runs like a champ, so what I wanted to do was take it into the living room and use it as my media center. I bought a card reader with front USB front port (USB 1.1 is all my MoBo can do) and I am planning on using that front port for my wireless keyboard & mouse from the couch.

I'm happy enough with what I have to work with now, since I already have a large collection of music/movies/TV shows on my HDD (and always the ability to transfer new files), but it would be nice to also be able to decode, watch and record TV (and home VHS movies) with my PC via my coax CATV (No Convertor Box or subscription for the CATV, but I do have a cable internet subscription from a CATV provider which should work)

Does anybody have any suggestions?

Should I buy a card? If so, which one?

Should I just get software? What kind? features?

Should I get both?

Or Neither?

Any help will be appreciated!

Thanks,
Chip