Sony D-NE10.
I have the iriver imp-350, Sony D-555, D-EJ1000, D-EJ2000, D-NE400, D-5, Panasonic SL-MP75. Various home equipment: solid state, tube, dynamic and electrostatic headphones.
Unless one wants to purchase the D-555 for the superior sound, the D-NE10 gets my nod. The Sony D-NE10 and D-NE400 have parametric EQ which allows for selection of the center of EQ adjustment for three bands as well as the level.
Having said that, to ask for help and then bite the people who offer it isn't very nice. Comparisons, in my view, are nearly worthless unless one *knows* the likes and dislikes of the people doing the comparisons. Take the time learn about what is being recommened and then make one's own comparison.
Paul