I love comic books but just don't have the time to be a regular reader. I like classic characters, though, like Superman, Batman, X-Men, etc but it's always difficult to find self-contained stories that don't require knowing all the ins and outs of what a character has gone through or knowing that certain events happened.

What are your favorite self-contained series or graphic novels in comics? I'm looking for suggestions of things that are great stories that happen to have comic book characters (like Watchmen, Dark Knight, Hush, etc.) rather than cheesy comic book adventures (like All-Star Superman, which is a little too golden age for me).