For some older stuff, try the late Prince Far-I.
Top shelf riddims, usually very heavy, and his voice sounds like a portent from the beyond. he did some great stuff with Adrian Sherwood's On-U-Sound label, as well as a lot of toasts over some great Jamaican riddims, usually on the slower side.
http://www.youtube.com/watch?v=kX56Uqm7G7M