So I am going to have to say for me that would have to be Yu Yu Hakusho. I can't ever get enough of the series its by far one of my favs even today though without spoiling anything here I will say the latter half or so of the series while good was a bit disappointing as apposed to the first half. Just to all over rte place/ Not to mention for me it ended on a not so good note. Though as a whole still is in my favs, and always will be. It is didn't hold as the series went on.