Cover of JLA: Earth 2
JLA: Earth 2 by Grant Morrison and Frank Quitely (DC Comics, 2000). I picked up Earth 2 after it was featured in The Year of Great Comic Book Moments. It's a short read filled with some spectacular art from Quitely featuring some pretty great Batman and Owlman moments on their opposite earths and one of the few times in recent years where Aquaman and The Martian Manhunter have been written as the bad ass mofos they should be.
This isn't an event story. It's just a well woven tale about good and evil and the nature of it all.
Recommended for the cinematic quality of Quitely's art and Morrison's ability to to get at the heart and true motivations of the characters.