Hmm I've seen many animes but the ones I can watch over and over again are (they aren't listed in order):
Bleach
Peace Maker
Fullmetal Alchemist
Death Note
Rurouni Kenshin
Azu manga Daioh
Pani poni Dash
Petite princess Yucie <-- (that emotionally destroyed me for like ever)
Rave Master
DBZ
Pea tear
Excel saga
trigun
cowboy bebop
trinity blood
thats all I can think of, the best though is Bleach ^^