Most likely the best point gaurd in the NBA. If not, at least a second close to Deron Williams. He's going to improve, and play at an even higher level than he is now, and that's not good news for the rest of the league. Plus, his prime will come when Steve Nash, Tim Duncan, and Kobe Bryant are winding down their careers, so he will have the opportunity to lead his team to a championship.
He'll be the top point guard in the NBA. He'll make the All-NBA 1st Team, and All-Star games...all that good stuff. I could see him and Deron continuing on where Nash and Kidd left off, as the best point guard rivalry in the league.