I have Verizon FIOS with a HD DVR. It is only 160gb and holds very few programs. I was thinking about moving over to the TIVO as it is expandable. You have to pay $13 a month + pay for the TIVO unit at $250 up to $500. You lose your Verizon on demand but tivo has their own. I have no idea what the comparison is. Anyone done this?