I love Douglas Adams. Vonnegut. Just started re-reading The Hobbit, and am rather impressed - I didn't fully appreciate it when I read it the first time, and he's a much better writer than I remembered.
Some H.G. Wells. Invisible Man really shows how much he grew as a writer compared to The Time Machine. The Island of Dr. Moreau is a good one to discuss and think about - picking at possible GLBT strands and following them to interesting conclusions.
I really, really liked Dune, and it drew me in more than any book in recent memory. Very well written, but frustrating if you don't like it enough to stick with it.
... science fiction is the only thing I read any more (small exception with LOTR). Some things I'd like to read in the future that aren't, but I haven't gotten there yet.
I really hated Huckleberry Finn. I like some of his writing very much, but it was the way he did dialect that really made me want to stomp on the book. I'm a fan of the "throw just a bit in to let the reader get the idea" type, not the "WRITE EVERY GODDAMN THING THE CHARACTER SAYS IN PHONETICS". It killed me.
I extremely dislike Dan Brown. It's not his plots - it's his writing itself. It's so... bad.