DAVOS, Switzerland (FORTUNE) - Be afraid. Be very afraid. That's the message from two of the world's most successful investors on the topic of high oil prices. One of them, Hermitage Capital's Bill Browder, has outlined six scenarios that could take oil up to a downright terrifying $262 a barrel. The other, billionaire investor George Soros, wouldn't make any specific predictions about prices. But as a legendary commodities player, it's worth paying heed to the words of the man who once took on the Bank of England -- and won. "I'm very worried about the supply-demand balance, which is very...