The Centronics ZAT 502 is a popular
HD tuner. Most of the
ATSC tuners are $100 or so, and if you're spending that much and wouldn't mind having a
DVR, check out the DTVPal
DVR. It's
ATSC tuner is capable of up to 1080i, has a
DVR, and
TVGOS EPG for around $200.