Yeah I just bought a 2600xt but I don't play any tv or HD dvds. I did read the reviews on them and everyone said they were awsome for that very purpose.
They're also only about $60-70. Here's a link to one:http://www.newegg.com/Product/Product.aspx?Item=N82E16814102700
About the tv tuners, all i can tell you is to shop Newegg for some. They have some good stuff.