Even if you have read CATCHER before, it is one of those books that (I think) reads differently every time you return to it, especially as you reach different ages and milestones in your own life.
This is also the book I know best and thus can lead a discussion on it well with a new group where everyone might "haz a shy" the first meeting.
It's also a good book to break the ice with because people usually really love or super-hate Holden (there is no in-between) and thus have lots they'd like to say on the matter. :)
If you don't have a copy of the book, contact me as I have ten or so spares.