Dreamgirls definitely......what a version Sky had in the 80's.
Elks, Slaughter etc are great tunes, but i'm not sure how to arrange them to work for today's type of shows. if you can do it, I bow to you....esp. if the snares play the singles in Elks as clean as the alumni does.
whatever you pick, think of Ron Allard's sig....that Skyliner sound.
find that, and the rest will follow