Does anyone known any good audition songs?

So my school is putting on High School Musical (Jr.) in the fall of 2011. I want to be Gabriella in the play so badly. I want this part more than any other part I've ever tried out for. I'm currently looking at Ariel's first part of "If Only" from the Little Mermaid. I want to show off the fact that I have a voice like Gabriella. I am a soprano and need a really good song. Thanks!