I want to buy better headphones for my mp3 player, but am not sure what works best. I have the basic earbud type that just sit in the outer part of your ear and they work fine, stay in place pretty good, but I don't get much bottom end unless I hold them into my ears. In the store I saw headphones that loop behind your neck and the ear parts sort of poke into your ears. Seems that would give a lot better bottom end. Anybody have some and how do they compare?