I've never heard of anything by Prince Buster. I'm not a big fan of Barrington Levy although one of my fave tracks is from him, Vibes Is Right, which ironically isn't a reggae track.
I quite like Luciano especially tracks like Psalm 24 & Come On Over.
I'm surprised you haven't mentioned some of the heavyweights like Burning Spear, Black Uhuru, Dennis Brown , Gregory Isaacs etc
Have you heard of a guy called Nasio Fontaine? Underrated and very Marley-esque and still performing. Also a band called The Gladiators who again are very underrated. And then there's Hugh Mundell.