At the bottom end of the headphone scale... i recently bought a set of the current Apple iPhone earbuds to update the ones that came with my iPhone4S and they have a much more balanced response with less highend edge. A great $30 upgrade for portable listening if you have an older iPhone.
In the studio I still use the AKG K240 as it's a sound I like and know (and I don't like cans that rest on my ears). Always test on the buds too though. The headphone out on my RME Fireface UCX is quite good for a small interface that you can easily gig with.