I have tried the following:
Bose in ear
Moda
JBL in ear
Shure e2c
Here is my take on all 4: Bose has the 2nd best sound of the four. I returned them because they just did not stay in my ear, they would pop out. Moda they have the worst sound of the four, they just look good. JBL they have the third best sound, but their sound is about the same as the headphones you get with the iPod, so why would you spend $79, when you can spend $29 for the iPod headphones. The e2c has the best sound of the four. The problem with e2c is you have to have the cord go around your ear, and it seemed uncomfortable to me.
I really liked the griffin ear-jams that worked with the old iPod headphones. They really made a difference, and brought the iPod headphones to a higher level. Unfortunately, apple decided to change the style of the iPod headphones and now the ear-jams no longer work with the new headphones.