Somebody already posted Eddy Grant. I had the hardest time finding his discography at record stores and online. His stuff is out of print. A couple blogs helped me out though. I had this song on repeat after hearing the first time.
http://www.youtube.com/watch?v=zhker3RS-T0
This isn't really reggae per say, but the sample is, and his flow pays homage to reggae. In middle school we were all wearing Raiders and Kings stuff because of these fellas, and I've never been to L.A..