Name a hero and what your favorite story is for them. I'll start.
Batman: Year One (duh)
Green Lantern: Secret Origin
Superman: All star Superman, but my favorite moment is in Final Crisis when he returns and just pulverizes everyone
Flash: Haven't read much Flash, need to rectify that.
Wonder Woman: Same as above
Martian Manhunter: Crisis of Conscience, I guess
Robin: Batman and Robin for sure
Joker: Killing Joke
Could do more, but it seems good for now. What do are your favorite stories for each character (you can choose any you like in the DCU)?