the build quality of the Grado's was something else someone brought up... right now my headphones are in their case, and in my backpack on the train into work with me everyday... build quality is a big factor for me on any purchase.. of the 3 links, the Beyerdynamic's look like they would be the most comfortable...

I would also guess that any of those would kick the crap out of the Bose i am currently using..

would these sound much better than the 880's?
http://www.headphone.com/headphones/beyerdynamic-t70p.php