I also have a set of the Sony MDR-7506 cans as Eddie mentioned. They are on Amazon for under $100 a pair. Don't let the price fool you. These are really decent cans for mixing and mastering. I didn't take a Berkley class but I did see Andrew Scheps discussing this.

I have used them to do complete projects from time to time. The good thing about using cans is they take the room out of the equation. I have also used $30 ear buds,,,,, the sound isolating type,,,, to do mixing and recording.



You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.