Toots and the Maytals albums "From the Roots", "Funky Kingston" and "In The Dark" have been remastered well, and have many classics from which nearly every reggae artist (and many others) have been inspired.
I second the Black Uhuru vote as well, "Black Sounds of Freedom", "Positive", and "Guess Who's Coming to Dinner".
The digital remasters of all the studio Bob Marley and Peter Tosh albums sound great, and really clean. Rita Marley should get credit too, since she wrote many of Bob's songs, and has many great albums of her own.