Want Vs Need

Preston and I were having this discussion earlier. I had a moment of wittiness and I liked it enough to share:

Preston: I need a second monitor for my new computer.
Amy: You NEED one? How 'bout you WANT one?
Preston: No I need it, because then I can have iTunes open on one screen and do other stuff on the other one. I'll get twice as much done.
Amy: No, you'll be twice as absent from the real world. You don't need it, you want it.
Preston: No, I need it.
Amy: You need your left leg. You want a second computer monitor.