Hey buddy,
I tried to use a TV Tuner a while ago, although it was a USB one I don't think that there's any difference between the two. Not that I know of at least, maybe someone else here will know of a difference.
Aside from what comes in the box, the only thing I think you'll need is a GPU, otherwise the CPU will be under a lot of stress, a Quad core might handle it ok but a decent GPU will make things a lot smoother to watch, especially in HD. You don't need a powerhorse, a 9500GT will do, if you don't want to play modern games.
Something else you might want is a seperate Ariel, perhaps with an amplifier - please forgive my spelling if that word is spelt wrong.
I used the ariel provided, and couldn't get anything, then I bought a simple ariel, and got a channel or two, but with an amplifier I got almost all of them, and I have some interference from a factory near by.
Anyhow, I hope that this helps a little bit. : )