Soprano Audition Song?

I am auditioning for The Appomattox Governor's School for the Arts (in VA) in January (for musical theatre). I am a soprano (G below middle C to high C, (on a good day, but consistently to the F an octave above middle C). I have some belt...to about middle C's A) This is really important to me, I really want to get in! A song I sing well is Green Finch and Linnett Bird, but I don't want to sing something Sondheim/so overdone. I'd like to show off my high notes, but I think a belt would be more appropriate for the audition. Thanks for any suggestions!