Analyst upgrades 7/29/2010...Arch Coal (NYSE:ACI) upgraded two notches to Outperform from Underperform at Macquarie... Boeing (NYSE:BA) upgraded two notches to Hold from Sell at Societe Generale... DST Systems (NYSE:DST) upgraded to Outperform from Neutral at RW Baird... Flagstar Bancorp (NYSE:FBC) upgraded to Outperform from Market Perform at FBR Capital... Meritage Homes (NYSE:MTH) upgraded two notches to Neutral from Sell at UBS... Monolithic Power Systems (NASDAQ:MPWR) upgraded to Strong Buy from Buy at Needham & Co... Natural Gas Services (AMEX:NGS) initiated at Buy at Global Hunter... Sun Life Financial (NYSE:SLF) upgraded to Overweight from Equal Weight at Barclays Capital... Sycamore Networks (NASDAQ:SCMR) upgraded to Outperform from Neutral at Credit Suisse... Williams-Sonoma (NYSE:WSM) upgraded to Equal Weight from Underweight at Barclays Capital...