How about the SKAtalites? Ok so the lyrics aren't so smart, but its good original ska. The Slackers have some good ska/reggae stuff, and Skavoovie and the Epitones was a fantastic new wave group but in an original style. I second the Toasters and Specials votes as well.
As a last point, I wouldn't really call Operation Ivy ska in and of itself. Ska influenced punk? Sure, but an upbeat chord on the guitar does not make ska music.
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