What is it specifically about TiVoNet that appeals to you? For my own needs, I've yet to see any compelling application for it.

All the DTiVo's support Dolby Digital through the optical output. There are some people who have had problems with the digital output and particular receivers (I believe Yamaha). I haven't followed this closely so I don't know the details. The absolute worst case scenerio would be that you fall back to the analog outputs, but it's unlikely that that would be necessary.

-Dylan