It's a difficult one, rather than going for my favourite games I'm trying to think of what would transfer well when you ripped the interactivity out of it, along with the potential for other storylines and not just tieing together cutscenes.
With that in mind, Dragon Age would probably do well. Darksiders would also be pretty sweet, spesh with rumours that there will be a Darksiders movie and comic book. You could probably do something about factions from any bethesda game too, like Fallout: Rise of the Brotherhood or something along those lines.