Be aware that a single Dual tuner DVR for two rooms will have limitations if there are times when you need each room to have independent viewing capabilites. If you are in Dual Mode and someone is watching or recording their show on a different channel on TV 2 while you are watching a different channel on TV 1, then you will only have one tuner at TV 1 to watch TV and no longer have the 2nd tuner for recording on a different channel of your choice at the same time. If this is not a problem, then get the 625. Or if it will be a problem, then consider keeping one 508 and trading in the other 508 as an upgrade to the 625. Dish will allow this for a nominal extra charge (as you will not exceed the 4 tuner lease limit). This will allow you to have full-time 2 tuners for your TV 1 in Single mode. That's what my uncle did, and he likes 625 in TV room and his old 510 for the wife in the living room.