Akira's good, but if you want something really, really, really cool check out Fist of the North Star.
Imagine Mad Max meets spaghetti western set in apocaliptic future. It's a sci/fi world where certain men have superhuman strength and kung-fu skills. One man in particular must save what's left of humanity from the evil hordes enslaving the world. If you like the movie, as I did, there was a TV series made spanning around 150 episodes, that you would have to buy, as I did, from Ebay, overeas for about $150. It's damned worth it to own the entire 13 disc (I think) set.
Also, there was a series similarly themed called Violence Jack. There were three hour long movies made. I myself just purchased them from MoviesUnlimited.com. Awesome stuff.
Also, the Gundam and Macross stuff is pretty cool...It's about the giant robot jet suits that fight. But it's more that cutesy art crap, whereas FOTNS and VJ are sharp lined artwork, no cutesy!
Enjoy!