I've got an ATi TV Wonder (not the cheaper version, the full out one) and it's pretty good.
I think it's got the same TV input chip as the AIW does, so if you like the AIW the TV Wonder should work out alright for you.
Gotta be careful with TV Tuners, there are some stupendously crappy ones. I recommend when you buy it get it from somewhere with a no-questions 14-day (or 30 day or whatever) return policy.
My TV Wonder has served me well though I haven't used it in a while, but with TV Tuners I highly recommend a try before you buy scheme.