Depends what you want (and how your head is shaped). Currently, I use AKG 81DJs (obtainable on http://www.headphone.com), but they tend to clamp fairly tightly. Not too comfortable with glasses. However, the bass is very, very good (probably too much, strictly speaking) and they generally sound good. They're also a closed design, so they cut down on outside noise quite a bit.

Plus, they're about 3000 times as big as the shuffle.

I am the Doctor, and THIS... is my SPOON!