We do not know

We do not know where this journey will end. Yet we know this: Human beings are headed into the cosmos. PRESIDENT George W Bush
People tell me the cosmos is near where the Grecians are.
The details of George's vision look a little dubious:

The proposed funding for the new exploration initiative will total $12 billion over the next five years, with much of it coming from reallocation of $11 billion within NASA's current five-year budget. The president called on Congress to increase the agency's budget by roughly $1 billion spread over the next five years.

If you look at the PDF of the proposed NASA budget (on the same page ) it is hard to determine where the money is coming from to build new spacecraft.