My current headphones that I leave at work are sony mdr-7506, I paid 55$ for the, 2 years ago. They are not that bad.
Now i want a set at home mainly to listen to the ipod when the wiffe is watching cooking show or in the bed when i want to watch tv while the wife is sleeping.
So they must not need an amplification, provide good insulation and they must not leak sound.
I want to listen mostly classical and instrumental music.
My budget is around 150$ but if I can get something real good for cheaper it's even better.