I'm Susan Chinsky with Morning Star. Most everyone agrees that Warren Buffett is one of the greatest investors of all time. He's assembled a collection of solid businesses that make up Berkshire Hathaway's portfolio.Most of these Warren Buffett stocks look fairly valued according to Morning Star, but some of these stocks are overpriced. So today we're looking at the three most overvalued stocks in Berkshire Hathway's portfolio as of midseptember. Even though Berkshire Hathaway holds them, Morning Star think ...