Said several times here but Saga is great. Mage: The Hero Discovered and Mage: The Hero Defined are absolute classics. Atomic Robo is probably one of the best humour based comics out there at the moment. I've recently been enjoying the Tower Chronicles and the recently finished mini series Dancer. George RR Martin did a graphic novel called Doorways that's a really good, short, sci fi story. Sandman, Scalped, The Shade, Daytripper and Casanova are also pretty damn good.