kate reinders has my vote- she looks and sounds the part, and has the body for it to boot (look up the pics of her from the good vibrations easter bonneta few years back)
laura benanti would be a decent idea except i wouldn't want to put a woman who recovered from a painful back injury into a role that would require her to (more than likely) be flipping around on wires 8 times a week
other options i'd go see;
kerry butler
siren from passions
megan hilty
katie clarke
amanda kloots ("bikini girl" from good vibrations, now on the tour of spamalot)
"Grease," the fourth revival of the season, is the worst show in the history of theater and represents an unparalleled assault on Western civilization and its values. - Michael Reidel