I like some of Skillet’s stuff too, but the female singer does more backing vocals than true duets. I’ve linked Breaking Benjamin and Diamante’s cover of Iris as an example I love.
Edit: typo
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Check out Pure Reason Revolution. Many of their songs contain harmonies between the singers Jon Courtney and Chloë Alper.
Examples:
- https://music.youtube.com/watch?v=IZW7UOMbmgo
- https://music.youtube.com/watch?v=09OmGyGWjmc
- https://music.youtube.com/watch?v=qbTSSD-nZZE
And of course My Eyes from Dr. Horrible’s Sing-Along blog, featuring NPH and Felicia Day :) https://music.youtube.com/watch?v=XsUGxcvn8yw&list=OLAK5uy_lfn5iZCtgLiUbh6gDG9gblBynzZvbRIwc