MOTM

Actually the question about headphones also needs to be accompanied with 
whether you plan to use them for mixing.  If so then you may want headphones 
with a flat response that are made for mixing.  I have a pair of 
Audio-Technica phones for that, model ATH-M40fs.  I believe AKG also has 
something similar.

If just for listening the I second the the Sony MDR-7506.  They are very 
popular, very comfortable and sound great.  They are the professional version 
of the commercial version, the MDR-V6 which is no longer available.  What 
that means is Sony changed the model number and color of the label on the 
MDR-7506 compared to the MDR-V6 so they could charge considerably more for 
them.  The MDR-V6 used to sell for as low as $70, the MDR-7506 sell for $100 
just about everywhere.

-Elhardt