Let's break it down.

Naruto- Too stupid, stubborn, hotheaded and reckless. Need much growing up to be ready for that position.

Sasuke - Emo and a traitor. Even if he was to be forgiven by Konoha he should never be given a position of power.

Shikamaru- Smartest by far and has all the quality's of a leader. Only lacks the drive and motivation. Doesn't need much maturing until he is ready for that position. First pick.

Neji - He has proven himself smart and calculating. And he definitely has the skills and potential for it proven by his fast rise to Jonin. Second pick.

Lee - He is a hard worker i give you that, but he's just to dumb. Think he's more suited for the role of an elite ninja, with a title that is known through out the ninja world that identify's him as one of the strongest, like Sanin that he or his group earns though some event.

Sakura - Even though we haven't seen to much of her, we know she is a student of a Sanin and now Hokage. She has excellent chakara control. She's pretty smart too. And she have developed good skills as Tsunades apprentice. She still has a way to go when it comes to skills and smarts but definitely third pick.

Shino - To much of a loner. To me he seems to be more appropriate as a elite assassin that strikes for the shadows without being seen (you know like a real ninja should be). Maybe a top ANBU.

Sai - He hasn't shown much. He is in ROOTS so i guess he should have the ninja skills, but we haven't seen anything except his drawing jutsu's. But mentally i think he is least qualified of all. His diplomatic skills would be the worst and he would probably end up insulting all other leaders he came in contact with and everyone would end up in war with Konoha.

So my list would be Shikamaru, Neji and Sakura.

Also as for potential, i think Naruto has the most potential when it comes to skills and that part will come naturally with time. What he needs is to mature mentally and there he has a long way to go. Shikamaru is the other way around. He's not far when it comes mentally but when it comes to the skills he need to get way stronger. Neji is probably the one that possesses both those aspect and with time he will get both of those naturally just be continuing what he has done so far.

But as someone said, someone from Kakashi's generation will probably take the position of Hokage first. Unless Tsunade sits on that position until Naruto & Co has aged to somewhere between 20-30. Then they might just have matured enough to be able to pass Kakashi & Co.