Change in RatingsAmerican Tower ( AMT) upgraded at Goldman Sachs to Buy from Neutral based on defensive characteristics in market where credit availability is expected to remain limited. Tower sector has underperformed recently due to leverage characteristics and perceived risks around ownership concentrations. Price target at $53. Boston Scientific ( BSX) downgraded at Merrill to Underperform. $12 price target. Company will likely not gain back market share as quickly as expected in 2009. International Flavors & Fragrances ( IFF) upgraded at JP Morgan from Underweight to Neutral. Estimates also cut, as higher energy costs and a negative currency impact should hurt earnings. Reliant Energy ( RRI) downgraded at Credit Suisse to Neutral from Outperform based on significantly higher cost of capital and lower earnings expectations as company reduces its collateral intensive C&I business and implements expensive hedging. Price target cut to $13 from $17. Reliant downgraded at Citigroup to Hold. Company is seeing lower commodity prices and its retail business was hurt by Hurricane Ike. $1 billion in new securities will also dilute current investors. $10 price target. Crosstex Energy ( XTXI) downgraded at Goldman Sachs to Sell based on asset damages from recent hurricanes. Expect reduced cash flows through 2009, resulting in a weakened balance sheet and difficulty in raising capital. Price target cut to $27 from $33.