Ten for the road:

Watchmen (#1), V For Vendetta and Swamp Thing by Alan Moore
Batman: The Dark Knight Returns and Batman: Year One by Frank Miller
Sandman by Neil Gaiman
The Invisibles and All-Star Superman by Grant Morrison
Planetary by Warren Ellis
Preacher by Garth Ennis

There's a number of other series I'd include, but they haven't been completed in a graphic novel format.

(Edit: As this was originally on the DC boards, I limited the above to DC books.)

Last Edited By: fubarthepanda Apr 8 14 9:55 AM. Edited 1 times.