The current issue of ConsumerReports (November 2008), p. 40, has a short, but seemingly sufficient, article reviewing DTV converter boxes.
Curiously, it lists an old model of the Zenith DTT900, a unit it previously tested and found satisfactory, rather than the current DTT901 which includes analog signal pass-through. The DTT901 is the only make and model which provides all the features which CR considered.
I had difficulty finding a retailer which had the DTT901. Using Google, I found it offered by Meritline.com, listed for $69.99 (a bit pricey, I think, but shipping was “free”). Meritline will process your coupon online as part of your order and charge only the net cost.
I can not tell you how the unit installed and works; I haven’t yet been sufficiently motivated to undertake the task of getting everything disconnected and reconnected again—to say nothing of the hassle of getting it all working again. (The value of the few television programs worth the time spent watching hardly outweigh the effort. If it weren’t for public television, I wouldn’t bother.)
Anyway, good luck. Regards, Al.