Forgive me if this is the wrong place to ask this question, but I am considering switching back to cable and looking at the new Tivo model. I have never had a Tivo before and am not sure if my family is going to like it. I like the idea paying for lifetime service up front to eliminate the monthly fees, but want to be cautious and see how it goes first. Is it possible to purchase a Tivo and go month to month first then convert to lifetime later, or do you have to decide at time of purchase and forever stick with that choice?