I'm a little fussy about the headphones I use; I've always been a fan of Sennheiser, and bought my first pair of over-ears from them - the PX200's. Besides for coming with the most ridiculous case, they are pretty good, and currently serve use as the resident bedside headphones.
They're light, relatively inexpensive and let enough noise in without affecting audio quality - useful for night-time listening. I had a pair of canal-ear style CX300's (excellent value for money) and CX400's (not worth the price difference and far too short a cable), but needed something for the office (see here for the current portable cans). I bought a pair of HD515's, but found the cord a real PITA on a desk; wires everywhere, too long, too short, etc, etc.
So I bought a pair of RS-180's for use at home; its sat on the shelf for a year, but the cord hassles at work forced me to try this out; I am truly amazed! These headphones are not only comfortable and attractive, but the cradle looks like a piece of art, and thanks to the Kleer technology in use, audio reproduction and quality is amazing.
Range is pretty good too; I can go for about 50m line of sight before encountering artifacts. Highly recommended!
PS. Price wise, they're outrageous. But so are good hearing aids ;-)