This could be a favorite band type thing, but just list the bands you play as the control for sound-checking and comparing your gear.
Kamelot; great variety of sounds.
Hopsin; test for hip-hop stuff
Insomnium; lots of high notes for a metal band
The music for Arby n' the Chief season 6; Just some simple techno.
Also, what are you favorite EQ settings? Mine are classical and electronic.