What song should i choose for house choir?

i go to a private girls school on sydney's north shore, and as apart of our inter-house competitions we have a music festival. the first half is all the school ensembles and a few auditioned items as well as the border choir, while the second half of the show is each house competing for best house choir, best conductor, best accompanist and the spirit cup for the house that has the most spirit. songs in the pas have been 100 years, run to paradise, don't stop believing, like a prayer. as i am conductor for my houses' choir i need to choose a song, arrange it into either SA or SSA split and i need suggestions that can showcase a group of girls whom the majority of aren't singers and that will wow the judges that shows dynamic contrast and shaping as well a soloist line. any suggestions are greatly appreciated! thank you