I love ska and am in a ska band myself. It's a little hard to tell what you would like because there is such a vast range of ska out there, but when most people think of ska they think of more modern third wave sort of ska bands like Catch-22, Streetlight Manifesto, Reel Big Fish, older Less Than Jake, Mustard Plug, etc. Those are some good general third wave ska bands and I assume mostly the kinds of bands you are looking for. I personally am more into ska/punk kind of stuff of which in my opinion the best bands are The Arrogant Sons of Bitches, The Fad, and the related although not totally ska Bomb the Music Industry!