BUFFETTBALL "The two bonded over a cheeseburger lunch last fall in Omaha: the éminence grise of investing, Warren E. Buffett, and the Cleveland Cavaliers all-star forward LeBron James. And last Sunday there was Mr. Buffett in Cleveland, wearing a sparkly T-shirt and attending his first N.B.A. game in years. A few years and some billions separate the two men -- Mr. Buffett is 76 and worth an estimated $52 billion, and Mr. James, 22, who signed a three-year, $60 million contract extension in July, has endorsement deals worth about $150 million. Last week's score: Denver Nuggets, 105, Cleveland Cavaliers, 93. ELIZABETH OLSON OPENERS: SUITS"