The Miglia DVR TV card ( g5 compatible only ) seems to work very very well in catalyst.
It gives you composite, s-video and tv tuner inputs.

http://www.miglia.com/
http://www.miglia.com/products/video...mytv/g4g5.html

a review is here
http://www.macnet2.com/more.php?id=454_0_1_0"