I list my top-5 as they are so close to each other that it would be wrong to name only one.
1.Mobile Suit Gundam Seed
2.Code Geass: Hangyaku no Lelouch
3.Tengen Toppa Gurren Lagann
4.One Piece
5.Aria the Origination
Honoronable mentions: Steins Gate, Hokuto no Ken and ef-Tale of melodies.
Really people. Watch Aria series! It's criminally overlooked despite have nice score in MAL. The first series (Animation) can be little boring but still perfectly watchtable and builds the characters, Natural is already great and final season Origination was something else. I have never teared as many time watching anime/movies/drama as I did during Origination and those tears were not because sad moments, they were because of touching moments. Really great series. So colorful and positive. After episode of Aria it was so nice to go to sleep and see some beatiful dreams....
