1) Want, but could live without.
2) Want, and could not live without.
3) Don't want, but need.
4) Don't want, and don't need.
#2 exists very rarely.
And #4 is given most often.
Of course, my parents, through my brother's suggestion, wanted to give me #4. Good thing mom figured to ask me about it first. WTF would I want or need a new bed for?