Change in Ratings Cadence Design ( CDNS - Get Report) upgraded at Citigroup from Hold to Buy. $11.50 price target. Stock also added to the Top Picks list. Hershey Foods ( HSY - Get Report) downgraded at Citigroup from Buy to Hold. $42 price target. Valuation call, as the stock is up 27% since July 1. Estimates also cut to reflect the lower expected demand from price increases and the net effect of hedging commodity cost. Lennox ( LII - Get Report) downgraded at Keybanc from Buy to Hold. Valuation call, though the long-term thesis remains intact. Luminex ( LMNX - Get Report) downgraded at Weisel from Overweight to Market-weight. Valuation call, based on a $26 price target. Business remains highly leveraged to 2 key partners. Manpower ( MAN - Get Report) downgraded to Equal-weight at Lehman due to belief that recent sharp deterioration in Europe and dollar appreciation will challenge future results. Price target reduced to $56 from $60. Robert Half ( RHI - Get Report) downgraded to Underweight at Lehman. Price target maintained at $23. Lehman believes company has little near-term upside potential due to deteriorating economic environment.