Hunter x Hunter
One Piece
Kaze no Yojimbo
Texhnolyze
Full Metal Alchemist

*and many others... it's impossible to do a top 5 list... some quick honorable mentions are Naruto, PlanetES, Condor Hero, Project ARMS, and ROD... and i'm still missing like 10 or 15 that are able to make to the top 5