The second half of 2012 will likely be as tumultuous as the first half considering the eurozone debt crisis is nowhere close to be resolved, Europe's recession, the Fed's extension of Operation Twist, a close presidential election, the so-called U.S. fiscal cliff and China's slowing economy. We asked a panel of asset managers to give us their top ETF investment for the second half of the year. Ronald Lang, principal at Atlas Wealth Management,