We have to leave the planet sooner or later and Mars is the only plausible choice at this time. A mission to to Mars would cost less than half as much if we don't plan to come back. Would you travel to Mars as a colonist? Intriguing.
UPDATED TO ADD: here's the entire issue of the Journal of Cosmology dealing with the topic of travel to and exploration of Mars. The papers are also published as a hardbound volume titled The Human Mission to Mars. Colonizing the Red Planet.