Here are 3 of mine:
#1 Watchmen. A masterpiece, close to perfection in both writting and drawing. A dark uchrony, with colorful superheroes. Masterful.
#2 Black Hammer. Super heroes again. Dark again too. The superhero theme revisited in the most original way since Watchmen, with exceptional characters and a suspenseful writing style.
#3 Hellboy (of course!). A big red supernatural detective, half-demon, who travels the world in search of the meaning of his life (between two epic fights). The 1st issues are magnificent.