SIR-T160 is DirecTV & OTA HD capable, but no IEEE1394/5c (aka "Firewire") out for recording.
SIR-T165 is OTA only, no DirecTV, but with IEEE1394 output. With this you can record OTA HD to a D-VHS machine like the JVC 3000 model. One caveat is currently there is a bug that it doesn't have a manual clock set; if the broadcasting station doesn't broadcast the PSIP time codes properly it can throw off the recording times.
If you are concerned about price and only need an OTA HD tuner, you may want to check out Samsung's SIR-T151. It can be found for about $400 online. The unit does not have all the features of the SIR-T165 OTA receiver, but it works very well for basic OTA-only support.