Just another point of info on the number of tuners needed...
We have primarily a two viewer household with the following;
622 in central location with component to main switching receiver. HDMI out to main bedroom. SD out via OTA distribution.
722k w/ OTA module in central location. HDMI to main switching receiver, SD out to OTA distribition.
For two of us, the combination of 4 SAT and 3 OTA tuners is almost the bare minimum, we could get by without one of the OTA tuners, but it does get used and I'd not want to part with it.
This would dictate that I'd have to have two Hoppers and a Joey just to get the functionality of my two ViPs. No OTA support would be a bitter pill to swallow. Why would I be interested? Because I currently have only two out of 5 displayes able to work with HD signals, and I can get three DMAs via OTA with vastly different subchannels, let alone the diversity offered by interstate PBS signals.