Not who you were asking, but I'm a big Moore fan as well:

* From Hell (Some might be put off by the original comic's black and white art, but there was a recent release that colourised them by the original illustrator)

* Providence

* Jerusalem

* V for Vendetta

There are the obvious ones: From Hell, V for Vendetta, and The Killing Joke, but I especially enjoyed his interpretation of Superman in For the Man Who has Everything and Whatever Happened to the Man of Tomorrow?, which are 2 of my favorite Superman stories.

But I most appreciate him for Swamp Thing, because that’s where we got our first appearance of John Constantine.