I second hoper's thoughts. The people I knew in the Accounting Dept were doing research in corporate governance (with game-theoretic models) and information economics (!)

. If I had to choose one of the above Business PhDs I would probably choose Marketing (heavy IO and Game Theory

, NOT the behavioral one with consumer behaviour etc) and if I were given a second choice Accounting (!) . It may sound weird but Strategy/Organizational Behaviour

do not suit me at all and I don't know what Supply Chain Management is but I suspect it involves a lot of Operations Research which I don't like. As for Finance, hm... I don't know but it seems too "specialized" for my interests.