Fist of the North Star is a classic, it pretty much defined action based anime especially stuff like Dragonball Z. I have only seen the first 20 or so episodes but it's a little different: it has one long story where each episode is kind of a story in itself which isn't as popular in anime but is very popular in western cartoons so I can kind of understand. Outside of that it's still cool, it's some thing you can just watch in random spurts rather than all at once.