You can't beat the Phoebe TV Tuner Card.
http://www.phoebemicro.com/
I brought one from an Egghead auction.
Advantages: Has a menu option that forces the TV picture to
be always on-top. In otherwords, when I'm watching
tv, make sure the overlay picture is not covered by
my current window unless I want it off.
Has a remote control.
Excellent picture. Plus, picture is a scalable window.
I have an I-Focus tv card in second pc that lacks this
feature.
When I want to upgrade 3d card, I don't lose my tv.
About $40 to $50 dollars.
Disadvantage:
Takes up an additional PCI slot over total AGP solution.