The wolf of mibu has good points, but I still think that Itachi is going to be Legendary strong in his prime.... So my vote goes for Itachi ... but I might be wrong
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Sad that Gaara wasn't on vote list because my top 4 for future ninjas's is:
Naruto, Sasuke, Gaara and Neji
Everyone showing great potential and because I believe Gaara is going to be Kazekage in the future..