The TechReport crew have put together a decent roundup of three MPEG2 TV tuners. Interesting thing about the roundup is that not only are each of the cards from different manufacturers, they each use a different hardware encoder chip as well.

"DirectX 9-class graphics cards have been available for some time, but a year ago, hardware MPEG2 TV tuners were only widely available from Hauppauge. This situation changed recently with the release of ATI’s TV Wonder Elite and NVIDIA’s NVTV, both of which offer hardware MPEG2 encoding. Hauppauge has also been busy revising and expanding its PVR lineup with products specifically designed for Media Center Edition 2005"