If you think both the HE-5LE and LCD-2 are heavy, then you should try the LCD-1. It's a tiny bit lighter than the HD580, clamps less, and sounds way better than the HD580. (Although, it doesn't have the bass response of the LCD-2. And I have still not seen a comparison LCD-1 vs HE5-LE.... mabye I missed it somewhere around here?)
Headphones are very personal things: I find the HE-5LE too heavy, and the connectors tends to get into the shoulders. To avoid that I tend to stay in unnatural position, and things get worst.
My head is small, and probably my neck is short :-)
I found the K702 very very comfortable and never had problems with the headband, so definitely it's a personal matter.
Edited by DefectiveAudioComponent - 8/13/10 at 2:07pm