I got a ATI Tv Wonder VE for $40. It's not stereo sound but is really good nonetheless. Some people dont like this card, but I haven't had trouble with it so far, and I've had it for 2 years now. Picture qualities sucked at first, but I found that the house wasn't getting good cable reception. Called cable company over, the increased the frequency, now the picture on my card is very very good.
BTW, no matter what card you're getting, I recommend you use
DScaler. It's a very small, very good program for watching TV.