Among the goals specified in the bill, the eight-year goal would require the development and flight demonstration of a reusable space vehicle capable of carrying humans from low Earth orbit to libration points in space, which could be used to assemble large-scale scientific observatories far beyond low Earth orbit.

The twenty-year goal would require development of a reusable vehicle to carry humans to and from Martian orbit, development of a human occupied research facility on one of the moons of Mars, and development of a reusable vehicle to carry astronauts from Martian orbit to Mars and back.

The bill will allow the best, most innovative mission concepts to compete. The bill also sets tough requirements for periodic independent cost and schedule reviews to ensure that the exploration initiative is properly managed.

*****************
I could criticize some of the goals, but I won't because they're possible to be modified for other purposes like Lunar Polar and NEO missions. I really hope the last paragraph is true and that NASA and contractor teams act as if it will be enforced.
Finally, I really think that a step by step prize system would be best but recognize the political difficulties.

-p