For me, the only Ska there is is the original Jamaican ska from the 60's. The group The Skatalites invented the form taking aspects of island mento (which fused African rhythms with European melodies) and American soul and jazz. So look for some Skatalites or any Ska collection on Trojan records and you can't go wrong.
Impedance suggested Steel Pulse. But they didn't come around until Ska evolved through many stages to become reggae, so they are a reggae band, not ska.
Toots and the Maytals blur the line a little more, having put out music beginning when it was ska, but keeping up as it evolved into rock steady, then eventually reggae. Funky Kingston is definately a reggae album, and not ska either. The soundtrack to Harder They Come straddles between rock steady and reggae with no ska to be found.
I know these musics can all kinda sound the same, but there are differences once you get into it.
Personally, I really love the rock steady period and the 2-CD collection "Duke Reid's Treasure Chest: Treasure Isle Rock Steady" is one of the best CDs money can buy.
:yes:
Never cared much for what the kids from London and Boston did with the form in more recent decades. --took the funkiness out of it IYAM