Looking for studio monitor headphones…

I’m looking for an inexpensive set of headphones I can use for video editing. Prerequisites are price and noise suppression. Basically, I need a set of decent headphones with good range around $30 that will easily suppress the whine of the four servers sitting on a rack five feet from my head. A cow-orker pointed me at head-fi.org but I just haven’t had a chance to do any reading yet. I figured Andrew would be able to give me some insight…