I've heard great things about sympathy for the devil, plus Diplopia was great so I imagine sym. is just as cool
If it's more of a cabaret sitch I'm not sure whether that kind of thing would be the best bet though, I'd go with some very simple to follow, direct stand up magic if I was in that position.
Of course I'd sway to the mentalism side, stuff like Khan Artist by max maven is really easy to do and is very direct, pretty much everything off the Stage magic DVD of his series is worth a look - Contimental is great,but can prove problematic sometimes if people don't quite follow your instructions!!
If it's going to be low lit you could do a nice d'lite routine to music, that'd be cool - despite the popularity among magicians, I'm sure it'd still be new to the people at your school.
D.