Soul Eater, Fairy Tail, Black Butler, and Durarara.

You might try Gurren Lagann, Soul Eater, or Sword Art Online. Those are pretty good actiony ones =^^=

Also Birdy the Mighty: Decode has beautiful animation, in my opinion, if you want to check that one out. Though the story might not be for all.

If you want something a little more quick, Angel Beats is only 13 episodes it's qwerky and kind of sad.

Looking at those....

Already finished [unless they decide to make more someday]

Busou Renkin
Campione! [Especially if you have an interest in ancient gods.]
Code Breaker
Code Geass
Darker Than Black
Ichiban Ushiro no Daimaou
Ixion Saga DT
Onmyou Taisenki [one word, Kogenta]
Polar Bear Cafe [everyone should watch this.]
Uragiri wa Boku no Namae o Shitteiru [if you like guy love anime, no sex]
ZOIDS New Century Zero

Recent/ongoing:

Dansai Bunri no Crime Edge
Free!
Gin no Saji [very much recommend this one.]
Hakkenden - Eight Dogs of the East
Inu to Hasami wa Tsukaiyou
Kuroko's Basketball
Log Horizon
Magi
Majestic Prince
Makai Ouji - Devils and Realist
Shingeki no Kyojin
Uchouten Kazoku
Valvrave the Liberator

Future Diary
No . 6

Gurren Lagann
Trigun
Initial D (im watching this one right now : D)

Initial D was my childhood. Whenever I hear Running in the 90s around it brings back a whooole lot.

I used to listen to running in the 90's on repeat for hours at a time!

Ghost in the Shell: Stand Alone Complex

WATCH "PANTY AND STOCKING WITH GARTERBELT" I LOVE THAT SHOW

Based on the fact that you really enjoyed AoT, I'd recommend 4 anime that are of the same vein, All of them between 12-25 epicsodes.

Claymore, Break Blade (or Broken Blade), Elfen Lied, and Fate Zero.

All very intense anime for both violence and drama. Definitely not for kids.

Some other honorable mentions from the people above would be Trigun, Initial D, and Ghost In The Shell.

Except Break Blade, it's 6 episodes/movies. Each almost an hour long.

Very interesting. I'm looking them up now :)

Yep, if you manage to finish those and enjoy them, I might have a few more for you.

maybe try something different? live action tokusatsu?

http://www.youtube.com/watch?v=VzcbVdw0QIo

(before you say. no- its not power rangers.)