Leon Cooperman's Top Stocks for 2013 By: CNBC.com News January 02, 2013 at 12:56 PM EST Stocks remain the best investment and stand to post "respectable" gains for 2013, Omega Advisors CEO Leon Cooperman says. Read More >> Related Stocks: American International Group Citigroup Express Scripts Holding Freeport-McMoRan Google, Inc. Halliburton Co JPMorgan Chase & Co Merck & Co Paymentus Holdings Inc Cl A Qualcomm, Inc. Wells Fargo