Which anime should I watch next ?

Angel Beats!

Another

Ao no Exorcist (aka Blue Exorcist)

Avatar: The Last Airbender (not an anime, but a really good cartoon)

Baccano!

Beelzebub

Black Butler

Black Butler II

Btooom

Cowboy Beebop

Deadman Wonderland

Death Note

Durarara!!

Fullmetal Alchemist

Fullmetal Alchemist: Brotherhood

Gantz

Hellsing Ultimate

Hetalia (Axis Powers, World Series, and Beautiful World)

Highschool of the Dead

K (aka K Project)

Legend of Korra (the continuation of Avatar)

Magi

Mirai Nikki

No. 6

Ouran Highschool Host Club

Psycho Pass

Shingeki no Kyojin

Soul Eater

Sword Art Online

Tonoari no Kaibutsu-kun

D. Gray Man [102+] : Towards the end of the 19th century, Allen Walker officially joins the organization of Exorcists that destroy the beings known as Akuma; mechanic weapons made by the Millennium Earl with the suffering souls of the dead. Allen has both a cursed eye and an anti-Akuma weapon as an arm, bearing the power of "Innocence", a gift given to him as an apostle of God. Allen, along with his fellow Exorcists must put a stop to the Millennium Earl's ultimate plot that could lead to the destruction of the world and all who live on it.

Samurai Deeper Kyo [26+] : In the year 1600, during the battle of Sekigahara, warriors Kyoshiro Mibu and "Demon Eyes" Kyo - the legendary slayer of a thousand men - engaged in fierce combat. Both men disappeared when a meteor crashed in the battlegrounds. Four years later, Kyoshiro is spotted on a rural highway, acting as a traveling medicine salesman. He is captured by the female bounty hunter Yuya Shiina when she discovers that deep inside him is the dormant personality of "Demon Eyes" Kyo himself.

Inuyasha [167+] : Higurashi Kagome, after being pulled down a well by a demon, finds herself in Feudal Japan, where she learns that a powerful jewel has been reborn inside her body. After the jewel shatters in an attempt to retrieve it from one of the many demons who was after its power, Kagome must join forces with the half-demon Inu Yasha (also after the jewel's power) to track down the shards of the jewel before its power falls into the wrong hands.

Full Metal Alchemist [51+] : The rules of alchemy state that to gain something, one must lose something of equal value. Alchemy is the process of taking apart and reconstructing an object into a different entity, with the rules of alchemy to govern this procedure. However, there exists an object that can bring any alchemist above these rules, the object known as the Philosopher's Stone. The young Edward Elric is a particularly talented alchemist who through an accident years back lost his younger brother Alphonse and one of his legs. Sacrificing one of his arms as well, he used alchemy to bind his brother's soul to a suit of armor. This lead to the beginning of their journey to restore their bodies, in search for the legendary Philosopher's Stone.

Sengoku Basara [13+] : In the age of the Warring Countries, Japan was fragmented in semi-independent provinces, governed by feudal lords or daimyo, who confronted each other in an endless struggle for power. Ambitious daimyos from every corner of the Archipelago had shouted their battle cry. They were Takeda Shingen from Kai, Sanada Yukimura, Uesugi Kenshin from Echigo, Azai Nagamasa from Omi, Tokugawa Ieyasu from Mikawa, and many more...

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Honestly there aren't many good animes that lasts over 100 episodes. Most gets really boring. Good Luck though. But the ones I listed above are really good!!!

Fairy Tail

yuyu hakusho

samurai x

digimon adventure 1 and 2

hunter x hunter

detective conan

hajime no ippo

rave master

This is my opinion:

Inuyasha

hunterxhunter

code geass

full metal panic!

mobile suit gundam

d.gray-man

sword art online (not many episodes)

magic kaito

You can view it for free applying: http://is.gd/coolflix

Bro, you did not watch "Ergo Proxy" ? come on . you really need to watch it.

try inu yasha

ATTACK ON TITAN