Assurant ( AIZ) upgraded at Goldman Sachs to Buy from Neutral based on robust earnings from special property and better 2008 results from Solutions segment. Also expect management to restart buyback program next year. Price target raised to $66 from $64. Boeing ( BA) downgraded at Bernstein from Outperform to Market Perform. $107 price target. 787 delays could continue, which will limit upside potential. Strategic Hotel ( BEE) downgraded at UBS to Neutral rating from Buy. However, price target and FY 2008 EPS estimates hold at $23.50 and $1.91, respectively. BankUnited ( BKUNA) downgraded at JP Morgan from Overweight to Neutral. Upside could be limited by the challenging credit outlook, and deepening housing downturn. Calamos Asset Management ( CLMS) downgraded at Credit Suisse to Neutral from Outperform. Stock has essentially reached its $32 target price. Cognos ( COGN) downgraded at UBS to Neutral rating from Buy. However, price target lifts at $55 from $50 while FY 2008 EPS estimates hold at $1.78. Quest Diagnostics ( DGX) downgraded at Wachovia to Market Perform. Stock is already pricing in stabilizing volumes and cost savings. Dick's Sporting Goods ( DKS) downgraded at Robert Baird from Outperform to Neutral. $72 price target. Valuation call, after the stock rallied following second quarter earnings. Dril-quip ( DRQ) downgraded at UBS to Sell rating from Neutral. Price target holds at $46 while FY 2008 EPS estimates dip to $2.70 from $2.80.