Headphone buying guide for those who need it, straight from the wonderful people of 4chan: http://img716.imageshack.us/img716/5181/1281667114951.jpg
I have the Grado SR60i's for open headphones (awesome sub-$100 headphones, I highly recommend them) and the ATH-M20's for closed back (only $25-$30, but still sound quite full and very comfortable. Kinda iffy in the bass frequency's, but it is only $25).