Hmm... For me, Yu Yu Hakusho, Ranma 1/2, Inuyasha, Saiyuki, Fushigi Yuugi, Azumanga Daioh, DB/DBZ (no GT!)...
I also love Yu-Gi-Oh... at least when it's the original Japanese release. They didn't even release the first season over here because the Pharaoh was sooooo brutal in the beginning, and they cut out the part where the bodies of the villagers of Kul Elna were put in a pot and boiled in order to forge the Millennium Items.
I wish they would make an anime based upon CLAMPS Wish manga. It's interesting in that it deals with God, Angels and Devils without becoming preachy or dull.
Another favorite of mine was one I didn't even KNOW was an anime until much later... ASTROBOY!!!