Thanks to everyone for the great advice. I have a line on a Leadtek WinFast TV2000 for $69US that looks like it will do the trick. Even burn a copy to CD or DVD.
I like the idea of building a TiVo from an old computer, but without digital cable, the TV2000 should get me started at low cost.
http://www.leadtek.com/multimedia/wi..._expert_1.html