I Need Help Choosing....

Okay my school I having a early talent show and for the 3 year being there for our last year thee we are posing to do te best performance we have done each talent show since 7th grade me, my friends, my boyfriend, and his friends have done one of Michaels songs and this year there is a prize of $200 for the winners. My mind has been completely wiped from ideas to do and we've done these following songs already.Smooth criminal, Bad, The way you make me feel, Jam, beat it, Black or white and We are the world. A lot I know but this year we have too win so I need help by choosing either from, History and thats it I need opinions on what should I do and how should we do it. And finally where can I get replica costumes under $100 On the Internet