Larry Summers or Janet Yellen, Who will Obama Pick as Head of Fed?

Garrett Baldwin writes: With Ben Bernanke prepared to step down as Federal Reserve chairman within the next year, the human resource debacle of locating the next Federal Reserve chair is underway.
Despite reports of Timothy Geithner, Alan Blinder, or Roger Ferguson being modest replacements (the latter I personally endorse), it seems that the candidacy has been narrowed to two.