THE PRICE of a bottle of the very finest Bordeaux is about to soar higher than ever, driven up by a second successive exceptional vintage - and by China's insatiable thirst for an investment. "The chateaux are saying to themselves: 'We'd like to ask just a little bit more than last year,'" Miguel Coumau, a Bordeaux-based wine broker, said. "They reckon people are prepared to break open their piggy banks to buy their wines."