I recommend the author/illustrator Shirow Masamune.
Orion,
Appleseed (four parter)
Ghost In the Shell
Dominion - "Tank Police"
He's kind of an omnivore's delight. He likes mythology and philosophy, but he likes to get there via lots of action, futuristic military hardware, prurient sexy robots and genetically modified creatures, wry, ironic humour, and inserts of slapstick humour.
PS, ignore any films or TV shows made out of his mangas. The originals are much better.
Edited, Feb 5th 2010 2:29pm by Aripyanfar