erm..

Berserk
Ergo Proxy ( some weird as fuck anime, decent though )
Steins;gate
if you liked one piece go for Fairy Tail
Sankarea

meh, I haven't seen half your list but w/e lol.

H2O was so good...
Also I watched Blood+ and stopped for a bit but never remembered to get back to it. It was good though... And brb watching blood+

P.S. this guy deserves some fgz

i dont care, there already exist a topic for recommendations so you must use that one - whether youre paying for the recs or not

Steins;Gate
Puella Magi Madoka Magica
Code Geass
Fullmetal Alchemist: Brotherhood
Ga-rei Zero


All pretty dark, thriller themes which you seem to like.

Fate/Stay Night (If you liked Tsukihime/Kara no Kyoukai, you'll probably enjoy this as well - another nasuverse title)
Fate Zero (If you like the above)
Toradora
To aru majutsu no index
Madoka