Analyst upgrades:

• Friedman Billings upgraded Synovus (NYSE: SNV) to Market Perform from Underperform on valuation following the recent weakness. BASF (OTC: BASFY) and Akzo Nobel (OTC: AKZOY) were upgraded to Buy from Neutral at UBS on valuation and believes cash flows can cover the company's dividend.
• JP Morgan upgraded H.B. Fuller (NYSE: FUL) to Overweight from Neutral citing benefits from lower raw material costs.
• CA, Inc (NASDAQ: CA) was added to Goldman's Conviction Buy List.
• Goldman removed Boeing (NYSE: BA) from the Conviction Sell List.
• WABCO Holdings (NYSE: WBC) was upgraded to Buy from Hold at KeyBanc.

• Oppenheimer downgraded Giant Interactive (NYSE: GA) to Perform from Outperform following the company's Q3 results as they believe a recovery of revenue from ZT Online will take longer than expected.
• Friedman Billings cut Walter Industries (NYSE: WLT) to Market Perform from Outperform as they believe the decline in steel demand will pressure met coal prices. The company's target was lowered to $30 from $53.
• Citigroup downgraded shares of Atlas Pipeline (NYSE: AHD) Holdings to Sell from Hold as they believe the company could potentially be in violation of its debt covenants as early as Q1. The company's target was lowered to $4 from $31.
• Oracle (NASDAQ: ORCL) was removed from Goldman's Conviction Buy List.
• Dover (NYSE: DOV) and Emerson Electric (NYSE: EMR) were downgraded to Underweight from Neutral at JP Morgan.

With Warren Buffett in the news recently, it is timely to look at a recent report from Paul Tracy, highlighting some of the best-positioned stocks currently held by Berkshire Hathaway (NYSE: BRK.A) -- Burlington Northern Santa Fe (NYSE: BNI) and WABCO Holdings (NYSE: WBC).

Here, the editor of StreetAuthority Market Advisor explains, "Buffett looks for such factors as intrinsic value, low debt, managerial expertise, a margin of safety and an 'economic moats' that offers some sort of sustainable competitive advantage." Here's a pair of transportation stocks that fit the bill.

"While many investors fret over the current volatility in the stock market, Warren Buffett is likely busy looking for value. Historically, in volatile up and down markets, Buffett has found even more opportunities than in raging bull markets."

"Burlington Northern Santa Fe is the second-largest railroad in the U.S. Berkshire holds an 18.2% stake in BNI, recently boosting that stake by purchasing 11 million shares to bring its total ownership to more than 63 million shares. Buffett has made no secret of his desire to purchase more of the stock.

"The key to discerning competitive advantages between the major railroad firms lies in the strategic location
of their networks. Specifically, BNI has the largest network of track in a region of the western U.S.
known as the Powder River Basin, which is home to America's largest reserves of coal.