So I have a TiVo Premiere which I love, but it's the only TiVo I've ever had. I'm looking to get my mom a TiVo with lifetime for Christmas, but I can't afford to get her a Premiere or something like that, or pay full price. I'm trying to get it on eBay for the cheap cheap. She is OTA only and has no use for any of the Netflix/hulu/etc, she would only use basic TiVo functionality. Tivo 2's are cheap on eBay, would that work for what I'm looking for? I want it to be OTA, and 2 tuners. Is this a unit people would recommend? What's the difference between Tivo 2 and Tivo HD? just the UI?