The other person I've herd that is in the running is Alum Armstrong. So, you have two Les Mis alum running for Peron. I think Philip Quast would be a wonderful Peron.
I'm cringing at the thought of either Madona or Idina being Evita. Madonna can't hit the high note and Idina love to screech her way through a show. Alice Ripley all the way baby.