In The Republic, Plato argues that the best form of rule is philosopher-kings; your answer seems to be the same. I tend to agree, but of course the logistics of finding such a ruler are difficult and subject to corruption.
Really, I think that there is no such thing as a perfect government, only a perfect citizenry, because the power of a government is always derived from the people within it. A philosopher king would not be able to maintain power unless either A) he was omnipotent or B) the people allowed him to remain in power.
False dichotomies are the sceptre of the philosopher king‽