"Bigger & Deffer", "MAMA SAID KNOCK YOU OUT", "14 Shots to the Dome" and "Mr. Smith" are essential. i have never actually heard "Radio" (his first LP) but that's supposedly a great album too although it will probably sound pretty outdated today (same with BAD). "G.O.A.T." is decent too, some really good joints on there.
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r.i.p. Johan D, Kaddu, Ricke a.k.a. "Slick Rick" and the rest of the fallen soldiers - you'll never be forgotten!