Another character I'd love to play on Broadway is Wendla Bergman from the show Spring Awakenings. I love the song "Mama Who Bore Me" that Wendla sings in the show.
The Rockettes are beautiful. Really, they're stunning. But the Christmas show itself is... not my favorite? I personally feel like it's overrated. The show is just a spectacle of dancing and lights (hence "Christmas Spectacular"!), there really isn't a plot. If you like tons of dance routines and bright lights, it's worth the $100+ a pop that they charge per ticket. If you'd rather see a show with a plot and are more concerned with book/lyrics as opposed to choreography, it might not be worth the ridiculous amount of money they charge.