Well I would definately say in my own opinion that Fist of the North Star (Hokuto No Ken in japan) is definately one of the best anime's period. Also I would have to say The original Mobile Suit Gundam, Gundam Z, Gundam 0083, MS IGLOO, Neon Genesis Evangelion, and Street Fighter II: The Animated movie are also some of the best animes I have seen.

Seriously, Fist of the North Star and the original Gundam are eternal classics. As is Evangelion, although it hasn't had as much time to be a classic.