AS KR, Braver and Kery said...YOUR music is the best to audition with. Try to take a representation of all the styles you listen to. When I was auditioning, I took about 30 CDs with me, some of which were:
Techno Animal "Re-Entry"
Amazing, tripped-out ambient with dubby undercurrents. Features John Hassel on trumpets. On good headphones, this induces narcosis
Material "Hallucination Engine"
Bill Laswell and Co. doing a fine job of dub-fuelled World music. The first two tracks are exellent, heaps of bass, percussion - tablas and more.
Portishead "Dummy" and/or "Portishead"
These albums can sound very harsh on lowly headphones, especially the vocals. They may even sound harsh on some brighter headphones.
Ice "Bad Blood"
A thickly dense production - great for seeing if your headphones can resolve layers upon layers of mud
Anything recorded by Steve Albini - this man knows how to record drums! His views on analgue vs digital are always worth a read too
Also, Chet Baker, Maria Schneider, PJ Harvey, Beasts of Bourbon, The Jesus Lizard, Godflesh, Maurizio, Jungle Brothers....
Well yeah...as I and others have said...the music YOU like!