Hmm... The Deal, on that list i gave you had an oi sound. I think Jesus Skins may have been kind of sXe/oi. But German lyrics, haha.
Far as ska the most traditional band i know of is The Isrealites. The refer to themselves as 'ska/rocksteady/reggae'. Good stuff.
If you're looking for more punk/ska there's The OC Supertones, The Insyderz, Five Iron Frenzy, Mojo and October Light. Hmm.. i know there were more, but off the top of my head, that's all i have.
Also check out The W's. They were kind of ska/punk/swing. Kind of goofy youth group type lyrics, but cool music.
And there is Denver & The Mile High Orchestra. They are more of a swing band. But they kind of had an identity crisis, doing both radio rock and swing. I think they eventually went the way of radio rock, but they had some awesome swing songs. Not a great singer, he took a little getting used to, but they still had some cool stuff. Look for Act The Scat album.