Naruto of the Hidden Leaf.
Now, I know I've done my fair share of Naruto bashing in these forums, but let me be the first to say, after reading the latest manga, Naruto WILL be one of the strongest shinobi in the Naruto universe.
With the ability to master Nature chakra, master [And greatly expand] Rasengan, and effectively use the Kyuubi, Naruto is shaping up to be quite the powerful ninja.
Also, to me, it looks like he's gonna be REALLY hard to kill.
With the regenerative abilities of the Kyuubi, and with the ability to further recover with nature chakra I don't think he's gonna be the pushover Naruto of old.
Oh, and now the RasenShuriken, one of the most powerful jutsu's in the Naruto world?!
Naruto's gonna be a beast [Literally?] in the future!