Pride and Prejudice came second, a result I'm not unhappy with either: I've always liked that book even before Colin Firth crawled into Mr. Darcy's skin. And I have fond memories of Douglas Adams's The Hitch-Hikers Guide To The Galaxy, too. They're the kind of books that you never forget, and never mind re-reading even if you already know how they end.
I'd never heard of His Dark Materials, though -- does anyone know if it's any good? I'm coming to the end of my present read and will need a good story to lose myself in again soon.
As to J.K. Rowling: I've yet to read a single one (!) of her Harry Potter-books. I know they're supposed to be good fun and all, but I once opened one, read a page, and decided I didn't like her style of writing much. And I haven't seen any of the Harry Potter films, either.