I've got some new 'phones too, just got them on the way back from the bank. But my local music store, Dawsons, only had some KRK headphones in, so I got me some KNS8400's.
Frequency response looks okay at 5Hz to 23 Kz.
They are quite light too, noticeably lighter than my current DT250's.
Sound wise... I'm not too sure. They don't sound that much better than my DT250's really. But I've got them now, and they are a little bit more comfortable, and I'd had the DT's for over fifteen years. And they had been crackling a little bit when driven hard, as though I'd damaged one of the drivers or something.