I have an old Roamio lying around, and would like to start using it again. I did harvest the hard drive out of it though, so I'd need to replace it. Would I want a 3.5" SATA 3 drive to replace it, and can I just drop it in and let the Tivo do it's thing? Also, what's the current monthly price for Tivo? I can't remember if OTA only makes any difference or not?