Top 10 Most Powerful Shinobi of All Time 

Written by Itachi Nguyen on LikeNaruto. Written quite a while ago, but his arguments were good, I think.
Keywords: rikudo sennin, uchiha madara, hashirama senju, uzumaki naruto, uchiha sasuke, nagato pein, uchiha itachi, strongest, naruto, naruto shippuden