When normal thinking or sane people are asked this questions, you'd likely get responses like, I want a car, I want to have my own family someday, I'll love to get a better paying job, etc. All these answers are responses from a rational process of thought which are in line with standard behavioral instincts.
But when the same question is asked of a psychopath, you'd likely get power and control as a response. This is because most psychopaths are manipulative, charismatic, fearless, and above all, very smart and intelligent.
Psychopaths can easily deceive, manipulate and hurt people in the process of getting what they want. They lack moral conscience and deviate from normal social behaviors. Such people are likely to break the law, commit a crime, even as far as murder because they often can't help in choosing to act between right or wrong.
Drawing from all said above, i personally believe that psychopaths think themselves to be the smartest and intelligent (which is often so) among others. Such people do not like being controlled and can go to extreme behaviors just to prove that they have power over others. Some of those extreme behaviors can be committing crimes, like corporate crimes to take over certain high positions, or murder, to show they have the power to take any life whenever they desire to.
In my own opinion, psychopaths wants no more than what normal people desire to have. The only difference is that Psychopaths will stop at nothing to get what they want, even if it means exercising unconventional means or committing a crime.