Casting Kohl

Just received an email that Christine Baranski has had to withdraw from this spring's production of Antony and Cleopatra at Theater for a new Audience. Scheduling conflicts are blamed. Director Darko Tresnjak will be looking for a new leading lady, and what a lovely opportunity for an actress of a certain age. Who would you like to see as Cleo? If Jennifer Ehle could age a decade or two I wouldn't mind that. Sigourney Weaver? Lindsay Duncan? Ellen Mclaughlin? Kate Burton? Christine Ebersole? Fiona Shaw? Helen Mirren? Who's your fantasy pick?