Here is the thing. My inlaws are thinking of upgrading to Directv, considering the $100 credit, seems like a good time. However they don't have a HDTV yet, but will probably get one by years end. I am suggesting they get the HDDVR unit, as the hardware is free, but they not subscribe to the HD service. That way, they will be ready for the TV when it gets here, and they have the networking and on demand service. Is this possible or does it throw the system off kilter?