Berkshire's collective cost basis in Apple, Chevron, Coca-Cola, American Express, and Occidental Petroleum is around $63 billion. The Oracle of Omaha has spent$77 billion alone buying shares of his favorite stock.When Berkshire Hathaway (BRK.A 0.37%) (BRK.B 0.09%) CEO Warren Buffett speaks, professional and everyday investors pay close attention. That's because the "Oracle of Omaha," as he's come to be known, has handily outpaced the benchmark S&P 500 in the return column over nearly six decades.Whereas th ...