I would also suggest sci-fi and horror as well. I'd be willing to bet those will sell far faster than VERY niche "classic" titles as "Fright Night" has proven.
People keep talking about streaming like it's viable. It's not. There are so many issues/problems/variables involved with that whole way of thinking that it will take so much time to iron out and even then, there will be people like myself who don't consider it "owning" a movie via some cloud...