Ten years ago this month, I saw swing Kris Koop in the role. I'd just seen her as Carlotta about a week earlier and wasn't sure how I'd like her as Christine. She was wonderful - gorgeous voice, passionate acting, and excellent chemistry with the rest of the cast.
I've seen a lot of Christines (Julie Hanson, Sara Jean Ford, and Trista Moldovan are all favorites), but Kris Koop's performance that night remains the best I've seen so far.