I really like Vampire and Werewolf on a conceptual level and frankly wish I had much, much more experience with them. As is I've never actually sat down and played either. Exalted looks good too, but I've got the same lack of experience problem. The rules don't appeal to me in many ways at all, but the ideas and settings are fun. Aberrant has to be my favorite though, and the only one I've played much of.
The only other Storyteller books I have are for Trinity and that was a mistake. I bought the Player's Guide and the core book together working off the idea that if Aberrant was so good, an associated game probably was too. It wasn't. Bored me to death.
I could do without the attitude some of the books are written in, though. The constant end of the world is coming soon, really, really soon thing that seems to inform Werewolf and Vampire (and to a lesser degree Aberrant) is aggrivating, but easy to ignore.