Personally, I prefer Gaara. He may be the youngest, but he understands a lot of things. He is basically pretty cool too. He cares a lot for his friends, kinda like Naruto. But he is smart, and not such a baka like Naruto.
raikage is badass and unstoppable but now that he lost his arm he isn't as strong as he was when he fought sasuke, my other choice would also be the mizukage, she looks really REALLY badass for a female character and is super sexy too, also why gaara?