Ichi the Killer also had a very satisfying ending to me.
Spoiler (mouse over to view)
Loved how Ichi was living his life at the end, just as a normal fellow, while the dead gangster's kid is being groomed into another Ichi.
Dragon Ball ended very well. Even though the last dozen or so volumes were pretty wishy washy, I think the last arc ended the series in a way that stayed true to the spirit of everything that had come before it.
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