For the library challenge go over J. Kaye's Book Blog to sign up.
I've decided to aim for the Stepping It Up level (75 books). Given the amount of research and reading I do I think I should get there. Be interesting to see.
For the spec fic challenge I'm going for the highest level - Obsessed. Given the majority of books on my TBR pile fall into this category I'd be surprised if I did not make this one.