Having seen all of the nominees in this category, I rank it as Kate Baldwin, Montego Glover, Christiane Noll, Catherine Zeta-Jones, and Sherie Rene Scott, from from "least favorite" to "most favorite" performance. I agree with all the above comments, Montego has a great voice, but her acting is so-so.
Sherie is giving an amazingly honest, and personal performance in an extremely smart and well-written show, and I believe she'll leave the Tonys with at least one award in hand.
My blog- http://okayentertainment.blogspot.com/