I enjoy the XIII games as well. Great story, although, it could get kinda convoluted or vague at the time. The whole thing between Fal Cie and L'cie is pretty messed up, and adds a pretty cool dymamic. Caius' story in XIII-2 was pretty cool to me as well. I might hold off a bit for the new one (financial reasons as well), but I'll definitely be picking the new one up much sooner than later.

In the meantime, I'm replaying the first two of the XIII series.