I don't really have one in the sense everybody else is talking about. I think seeking, knowing, and freely sharing knowledge with everybody is more important than the glory or money that goes along with it. I think hording most knowledge is unethical and a detriment to existence. If anything I would hope to come up with something that would help a lot of people in need and give it to them.
Hypothetically if I wanted to be greedy I would want to have invented the wheel, all methods of producing heat, and the numbers 1 and 0 and devise a way to control the patent on them forever.