I've never been crazy about using cans, but do so when I have to.

AKG K701's here. Fairly easy to drive (62 ohms), comfortable (except the headband is pretty stiff/hard at first but gets better), and if you can get through the long break-in period (3-4 weeks) you'll have great SQ.

I'm not keen on the white "iPod" look, but otherwise worth the $309. I paid a couple of years ago. A vast improvement IMO on the 240 Studio Monitors of old, and I like their sound and fit better than the Senn HD600's, Koss Pro 4/AAA's, Sony V6's, and Grado Torture Devices™ I used to have.

Accurate/'neutral', great dynamics and soundstage (as headphones go), and excellent midrange. No real flaws sonically.