Hurricane Sandy spared the U.S. markets from major damage as it roared through the northeast the last three days of October. At month's end, Greece and China topped global markets. As of midday Wednesday, SPDR S&P 500 (SPY), which resumed trading with the rest of the market after a two-day halt, was down 2.12% for the month at 140.92. PowerShares QQQ (QQQ), tracking the 100 largest nonfinancial stocks on the Nasdaq, was off 5.41%. SPDR Dow