These are all outside of the genre you mentioned, but they're worth checking out.
Last Exile
Broken Blade (6 episodes, each 45 minutes long. Fantasy mecha show, great animation)
King of Thorn (a movie, check out the manga too)
Jormungand (ongoing series, a lot of people comparing it to Black Lagoon)
Jyu-Oh-Sei
Seirei no Moribito
Chrono Crusade
The Tower of Druaga
Fractale
Dead Leaves (another movie, by Gainax studio, fast nonsense style similar to FLCL)
Paranoia Agent
Bobobo-bo-bo-bobo (logic does not exist)
Some of these will put you in awe, others go in a separate direction altogether, you're welcome.