At either end of the price spectrum, we have been using the GermanMaestro GMP 8.35 D (these headphones really are indestructible) for our language labs and the music department, and for lighter use the Koss Stratus UR10. Both have been very reliable.
The GermanMaestro's are studio quality, but in my experience they can take survive the toughest enviroments. We've not had to replace one pair yet (our first batch was purchased 3 years ago!).