First Hokage: Hashirama Senju(most peacful)
Second Hokage: Tobirama Senju(best security and police)
Third Hokage: Hiruzen Sarutobi(most mediocre but also would stay as Presikage longer then anyone)
Fourth Hokage: Minato Namikaze(most charismatic and youngest Presikage)
Fifth Hokage: Tsunade(best hospitals and......boobs i guess)
On the thread topic, I would say Danzou, Minato or Hashirama would be the best candidates. Minato and Hashirama being the favorites. The US does well with charismatic Presidents (well until they get assassinated) and on top of that, these three candidates would slaughter you if they deem it necessary, something the US has been known to do for centuries.