You're missing my fav Sterns to date: LOTR and TSPP. Spiderman is up there as well, so I choose that one. It's the one I would go for in your list.
I have been debating back and forth on adding an Xmen or a Tron. I borrowed a Tron and really enjoyed it, but the depth of Xmen is incredible.
Cheers,
Duane