I use Beyerdynamic DT-100 Studio Headphones
for er... Just about everything... recording my little studio, when I used to host a radio show, working on post-production, and on my electronic kit etc.
Expensive but there's a reason they can be found in recording studios all over the world. Great sound reproduction, great isolation, virtually indestructible and every bit is available as a replacement part.
Not too good for the iPod tho :D