The works of Joe Iconis are becoming something of an audition standard right now. In my latest rounds of college auditions, I've heard more people use "Michael in the Bathroom" than ever before.
So given his rising popularity when it comes to audition material, there are certainly better choices than others when it comes to his work. What I like most of Iconis' songs is that they truly let you perform, aren't vocally impossible and certainly allow for less-than expert accompanists to play.
So here are some suggestions, 3 for men, 3 for women. I've also gone ahead and cued what section I would recommend.