Recommendations for a TV tuner add-on?

[HumblePie]

I'm looking for a great to outstanding TV tuner add-on card. I've heard good things about the Leadtek Winfast Expert card. Is there a good card though with 12 bit decoding and rendering as opposed to the 10 bit of the leadtek card? There isn't nearly as much info based on tv tuner add-on cards as I would like to see. So hopefully someone here will have some answers I'm looking for.