Raiton - Sasuke. The ability to perform a Juubi level feat through usage of Kirin still trumps anything other characters have accomplished within the manga.
Suiton - Kisame. Tobirama's an honorable mention in the sense that his Suiton is tailored for CQC and penetration, but Kisame's is conspicuously more powerful.
Doton - Onoki/Hiruzen
The only reason Deidara wouldn't be up here is because Bakuton is a Kekkei Genkai.
Fuuton - Difficult to say. I'd reckon that on its lonesome, Danzo would be the best when taking into consideration of both power and versatility, but I would place Jiraiya up here as well given that Ma's Futon enables him to create very effective LoS blockers for elaborate feints and guerilla tactics or flat out bolstering the power of his Katon. I'd say Ma's Fuuton is significantly more dangerous than Danzo's Futon when including Jiraiya's entire arsenal while Danzo Fuuton on its lonesome is stronger and more versatile.
Katon - Sasuke. Amaterasu is the pinnacle of Katon and Sasuke's usage of it via manifestation of lethal weapons for Susano'o makes him the most eminent katon user within the manga given that penetration with Katon is an unprecedented feat.