1. Dragon Ball/Dragon Ball Z: just because it was the first
2. Princess Mononoke: whoever likes anime, must like Miyazaki
3. The Melancholy of Haruhi Suzumiya: 'cause it changed the world of anime
4. Clannad After Story: very sad, but very good
5. Evangelion: 2.0 You Can (Not) Advance: the tv series is awesome and this movie is the best thing of the franchise
6. Spice and Wolf II: Holo, Holo, Holo. Enough said.