Personally, I like Schiller (http://www.econ.yale.edu/~shiller/) more than Roubini. His record: he wrote a book called Irrational Exuberance, and the .com market promptly crashed. He wrote papers from 2003 to 2007 suggesting the housing bubble was real, what it's effects were and how it might be mitigated / avoided.

Where Roubini simply says we're all walking in the dark, Schiller is the rare critical eye who offers, in public, insight about where and how things are going wrong.