So much good anime already listed on this thread!

Watched most of them and love them:

- Samurai Champloo

- Code Geass

- Akira

- Evangelion

- Full Metal Alchemist (Brotherhood)

- Attack On Titan

- Trigun

- Berserk

- Ghost in the Shell

Let me add some others I loved that may be less popular:

- One Punch Man

- Cowboy Bebop

- Elfen Lied

- Ergo Proxy

- Blue Eye Samurai

Hard to pick a top 3, TBH.