Currently I have a 500GB Tivo Bolt with a cable card + OTA which is 4 years old. My subscription is due soon and I'm not sure I want to pay the $549 all in price or get a new Tivo. I don't even know the differences between all the different Tivo's. What's the best deal out there right now for Tivo's? Keep my 4 year old Bolt and pay the all in? Or get a new Edge and pay the all in? I don't know, I'm confused.