The animated series was the best interpretation of Batman. None of the others really showcased the detective aspect of the character quite as well. Plus, as mentioned before, it had the perfect amount of grit.
Nolan's movies are great, but I've lost patience with him refusing to put in any villains like Poison Ivy and other stuff like actually calling the Batmobile, the Batmobile. It's nice that he's taking Batman seriously as a character, but let's not forget you're making a movie about a man who dresses as a bat and fights crime. There's only SO serious you can go before you start to look a little silly.
And, of course, there's ALWAYS room for Adam West.