Not sure what took me so long, but I just discovered Thank You Scientist.
What a great band!
I only have their latest, "Stranger Heads Prevail", but I'm sold.
They mash up a bunch of different styles (funk, fusion, metal, traditional prog, even a bit of Michael Jackson), but it never seems to sound forced. Very seemless. While not strictly a prog-metal band, they should appeal to many adventurous listeners.
Besides the usual guitar (including a fretless guitar), bass, drums and vocals, they also add sax, trumpet and violin for a very unique sound.
They are touring with the Haken, so an already great show just got better!