Depends on what you want to accomplish. If you want to continue inflating the stock market, then McCain is the best front runner. If you want a stable monetary system, then it is all about Ron Paul. He wants to bring back the gold standard. Which would take care of inflation, and force society to take care of some other problems such as unnatural distributions of wealth.
If you want someone who will attempt to keep the economy healthy while trying to make sure Americans all get some of that pie, then it would be Hillary or Obama.
If you want ultimate sustainability, you would want someone who will start thinking in terms of the Earth and its capability to supply material. Money will be meaningless if there is nothing to buy with it.
That would be the Green Party.
Cynthia McKinney or Raplh Nader.
If you want freedom without regulations protecting business or people..libertarian is better. I don't know the candidate