Songs not to use:
Loverboy: Billy Ocean
Ring My Bell: Donna Summer
Solid as A Rock: Ashford and Simpson
Big Balls: AC/DC
Dude Looks Like A Lady: Aerosmith
The Thong Song: Sisqo
I Want A New Drug: Hewey Lewis & The News
Seriously though....I would think that not only do you want a song that you can pose to or something original but the judges aren't going to be 22 years old either. If you can pick out a retro song, something that they know and grew up to, it could put them in a better mood. Anything to help give you an advantage. And if the crowd gets into it aswell, all the more better. Just a thought.
Or you could try something like this...
Start with the Chicago Bulls theme song. Then a little way sinto the song, beatmatch and mix in the begining beat to Walk this Way by Run DMC and let is overlap. But just loop the beat and guitar part. Don't use the lyrics. Then go into Another One bites The Dust beat or the begining of New Sensation by Inxs and loop that.
I am assuming you know what loop means if you know how to use a mixer. Anyways...just some ideas.