The Now Playing list in my 35 hour Tivo always includes more programming than I could possibly watch and keep current on. And I haven't even had it for very long.

The Tivo is designed so that even a small hard disk is useful: It's prioritized, so that there are certain programs that I tag as "Save until I delete", some are "Save until <specified date>", and others are just there in case I decide to watch them but they'll get deleted to make room for new content. I can let the Tivo determine the priority or I can tweak it myself.

The only way I could imagine wanting a bigger Tivo is if I tended to want to save a lot of different things for a very long time. Or if everything I wanted to save was always two-hour movies. But as it stands right now, most of what I want to save is half-hour series, and only save them until I've had a chance to watch them, then I delete them when I'm done. So I can't envision needing a bigger hard disk right now.