Albums weren’t altogether the *thing* by Jamaican artists. A couple of reggae era records which I’d say were essentials are:
-Equal Rights by Peter Tosh
-Heart of the Congos by The Congos
If you then get into the whole compilation thing, then see if you can track down some of the great output from Blood and Fire records, including I Roy (Don’t check Me With No Lightweight Stuff – classic toasting), anything by King Tubby, Prince Jammy and the like for dub. Big Youth is great, too.
Or, look at the various boxsets from Trojan – they’ve got some great stuff too, all the way from ska, through rocksteady, reggae, roots, lovers, dub. Any style you like….