Seconding Incal. Just finished it and I fucking loved it.
A lot of Moebius' solo works are great too even though they're shit hard to find.
Frank Miller is a pretty good writer, though my favorites by him are his collaborations with Geof Darrow, Ronin, and obviously his Daredevil stuff. Elektra Lives Again is worth a look into even though the art's ugly as shit
Personally though, my favorite comic's Akira. I know it's more /a/ than it is /co/ but it's seriously some of the best shit I've ever read