uhmm...in no particular order after the third:
1.Higurashi no Naku Koro ni (the complete serie)
2.NHK ni Youkoso!
3.Kino no Tabi
•Suzumiya Haruhi no Yūutsu
•Last Exile
•Kanon
•Honey and Clover
•Air
•Elfen Lied
•Great Teacher Onizuka
obviously, there are lots of animes that I could put here, but these ten really changed my mind
...for the better and for the worse