It's really about the writers for me, art is important but with a terrible story it's worth nothing, these are my favourite writers and some of their works:
Warren Ellis (Next Wave: Agents of H.A.T.E., The Authority, Transmetropolitian, Ultimates Galactus Trilogy), Garth Ennis (The Boys, Preacher), Alan Moore (Watchmen, V for Vendetta, The League of Extraordinary Gentlemen, Miracleman), Grant Morrison (All Star Superman, Animal Man, The Invisibles, Kill Your Boyfriend) Mark Millar (Kickass, Wanted, Ultimates 1 and 2, Superman : Red Son, The Authority) Neil Gaimon (Sandman, Marvel 1602, Miracleman), Brian Michael Bendis (Alias, Powers) and Brian K. Vaughn (Y - The Last Man, Runaways, Pride of Baghdad, Ex Machina).
Also Cable and Deadpool (Fabian Niceza) is a fantastic comic.