[Soundhead]

The problem with the senns is that they are on the ear instead of over. This causes discomfort it seems for long listening.

 

[Hero Kid]

That's the trade off if you want good isolation, I wear mine for 5+ hours without any discomfort. Each to their own but I still stand by my HD 25's as the best portable headphones around at the moment.

 

[younglee200]

Sennheiser HD 25 1 II
 
I honestly don't think there's anything else that better fits your requirements

 

[Anaxilus]

Are these things really comfortable and at the same time isolating compared to circumaurals like M50's?  Every on-ear I have ever tried was uncomfortable and annoying....