it is hard to go wrong with recent pressings from simply vinyl.
everyone has their favories, but i would argue that it would be difficult to find better than peter tosh equal rights. of course, burning spear's garvey's ghost can't be beat.
the bmw reissues are fantastic, but not always superior than the latest 140g reissues.
otherwise, look for the late 70s/early80s island pressings, especially where they put some $ behind the bands. also worth checking out the virgin pressings, notably those from bands like the gladiators, abyssinians, etc.
try to stick w/ UK, Canadian, and US pressings. JA pressings are a nightmare.