CHANGE IN RATINGSBed Bath & Beyond ( BBBY) upgraded at Goldman Sachs: Goldman is upgrading BBBY to Buy from Neutral due to likely Q4 earnings beat, aggressive share repurchases and higher guidance. Expect Q4 earnings to be above consensus ($2.44 vs. $2.40 consensus) and believe management guidance for 2007 earnings is overly conservative. Price target remains $45. DST Systems ( DST) upgraded at Morgan Stanley: Morgan Stanley upgrades DST Systems from underweight to equalweight with a $74 price target. EMC ( EMC) upgraded at UBS: EMC upgraded to Buy rating from Neutral at UBS. Price target jumps to $16 from $13.50. 2007 eps estimates lift to $0.63 from $0.60. Ensco ( ESV) downgraded at JP Morgan: ESV was downgraded from Neutral to Underweight at JP Morgan. Estimates also cut, as Gulf rig rates and International numbers are at risk because of oversupply. General Dynamics ( GD) upgraded at Cowen: GD was upgraded to Outperform at Cowen. Company should be able to deliver above-consensus growth through 2009, led by the Combat division. Global Payments ( GPN) upgraded at Wachovia: GPN was upgraded from Market Perform to Outperform at Wachovia. Stock over-reacted to weak earnings last week. Company has a smart management team, strong balance sheet and the best-positioned assets in the space. IBM ( IBM) upgraded at UBS: IBM upgraded to Buy rating from Neutral at UBS. Price target jumps to $118 from $100. 2007 eps estimates lift to $6.70 from $6.62.