Bob Marley - LEGEND (Everyone starts here, hopefully you won't stop here...)
Quality Albums in Reggae are actually pretty rare, you might be best to start with some samplers, of which there are a million..
some artists, like Yellowman, Gregory Isaacs and Dennis Brown were great singles artists, but don't really have any stand-out albums. (NIGHT NURSE by Isaacs though is pretty solid).. I'm not big on "dance-hall" style, so most of my recs are from the 70's and early 80's:
Black Uhuru - RED
Jimmy Cliff - THE HARDER THEY COME SOUNDTRACK
Steel Pulse - HANDSWORTH REVOLUTION
Peter Tosh - EQUAL RIGHTS
Culture - TWO SEVENS CLASH
Eek-A-Mouse - WA-DO-DEM
Jacob Miller & Inner Circle - REGGAE GREATS
Lee "Scratch" Perry - REGGAE GREATS
Aswad - A NEW CHAPTER
Augustus Pablo - KING TUBBY MEETS THE ROCKERS UPTOWN
that's enough to get started
-jar