I have two sets of headphones that I use.
First, the ones in my sig. LTB 5.1 surround sound headphones. They are AMAZING, excellent bass, real directional headphones, good mids and highs.
My portable headphones are Sony's awesome MDR-G74SL street-style headphones. These headphones have the best low-range frequency I have heard from portable headphones. They are absolutely stellar.
I have a set of Logitech 4.1 surround sound speakers at home, but I never use them because I also have a decent home theatre set up which blows most computer speakers away.