A couple of headphone needs,

I have had good success with feedback from other AudiogoN users, so I am asking:  What have you enjoyed in a pair of inexpensive headphones.  I asked this before, but have yet to purchase and now have an expanded need, both I am my youngest son are in need of a pair.  For my son it is his main system and for me it is my bedroom/2nd system...and both are the Nakamichi SoundSpace 5.   I have not had any headphone experience for many years.  In the past it has been those green Koss 4a?,  Audio Technica electret condenser.  Also had used some others in the past but nothing in years.  For both my son and I they would be used mainly for late night listening.  Thanks for your thoughts.