Considering the new manga as well, my top list would be:
1. Hashirama - established the whole hidden villages system, stopped the endless world war;
2. Hiruzen - managed to rule the village for decades without it getting demolished;
3. Tobirama - was able to maintain relative peace between Uchiha and Senju and pretty much improved everything Hashirama started;
4. Kakashi - rebuilt Konoha from ruins into a NV Manhattan, but that might have something to do with Konoha having the Doomsday Machine (meaning Naruto and Sasuke) which made it impossible for anyone sane among the other countries to attack the village;
5. Minato - died shortly after becoming Hokage and hasn't achieved anything relevant, but on the other hand Konoha didn't get completely destroyed during his rule;
6. Naruto - Konoha was probably in its prime with him in charge, but I don't think he has done anything significant as a Hokage, just maintained everything his predecessors achieved. He would most likely be higher than Minato in this list if not for Konoha's destruction we have seen in the new manga.
7. Tsunade - absolutely the worst imo. Hasn't achieved anything good but let Konoha turn into ruins.