+1 on the sly dunbar (dr) and robbie shakespeare (bs)!
a little bit of research on their albums goes a long way though. personally, i don't care for sean paul or beanie man that much (2 musicians they have worked with).
alot of the stuff under "sly and robbie" is tight, their stuff w/ the band black uhuru and peter tosh is really cool.
the bassists bill laswell jah wobble have some cool dub reggae stuff. again, do some research though... they both have non-reggae projects (punk, death metal, free jazz, etc) and some less traditional reggae projects.
laswell has is also involved in some cool "bam bam" projects... this is a style pioneered by sly dunbar that fuses indian tabla sounds w/ reggae grooves. tabla beat science is a fave of mine!
if you like some harder stuff, stu brooks lays down some tight grooves with the dub trio... they are doing a dub meets punk thing.
remember, less is more! especially with reggae!