I would make a movie that would be close to my heart and that way I could put everything Ive got into it. The best way to go if you want people to get in to it make a documentary about an issue that is over looked but still effects everyone around that issue. even if they dont know it. But with any movie it all depends on who is judging it and what they like.
Good luck with the contest and as long as you put your heart and soul into it whether you win or lose, you will have something to be proud of.