Marvel shares have been on a tear in recent months, due to excitement about Iron Man. But a bitter legal fight over ownership may dog the shares.

Citigroup became a candidate for trouble when its stock produced a "double top" in the eight years since 2000. That's often an ominous sign. Then, last year, the stock's relative-strength indicator broke a 17-year uptrend, and multiple price supports gave way, Yamada says. She suggests the shares could easily fall to 15 and possibly to 10.

Cincinnati-based bank Fifth Third Bancorp (FITB), which recently said it will slash its dividend by 66% and sell $1 billion in convertible preferred stock to shore up its balance sheet, has declined to 10 from 69. Having broken through a 10-year support of 30, the stock may be experiencing a final "capitulation" phase and could fall another 50%, Yamada says.

Then there's Merrill Lynch (MER), recently about 33. Though Yamada says the stock conceivably could rally to 44 or 45, she'd use any strength as an opportunity to lighten up -- because the risk is toward 30 or even 20.

Petrobras stock, which has more than doubled in the past year, could rise another 25% if three offshore wells discovered by the company prove as plentiful as some expect.

Investors who buy Huntsman shares around $10 are paying full price, but also betting that the Apollo deal eventually will be done, at a higher price, probably in the high teens.

But a 31% stock slide since October, compared with the mere 6% blemish on its peers, may have factored in most of these downside risks. "We believe that the intrinsic characteristics and capabilities of IR's revamped business portfolio are not yet widely appreciated by investors," says KeyBanc analyst Jeffrey Hammond, who initiated coverage of the stock last week with a Buy rating. Skepticism about market challenges and the ability to execute "is fully priced into IR shares." In fact, the combination of scale and market-leading brands should help increase profits and cut costs, with bullish money managers expecting the company to earn $6 a share by 2010 -- up from an estimated $3.69 in 2008 and $4.35 in 2009. Its less cyclical assets also should drive more predictable returns -- once the market wises up to the reformed stock, which is rated Buy by only five out of 17 sell-side analysts. KeyBanc's price target: 49.

He particularly likes Marvell, which he thinks has $1.30 to $1.40 a share in earnings power; give the stock a multiple of 20, and you'd get $26 to $28 a share, about $10 above Thursday's close. Berger also believes ON Semiconductor (ONNN) is too cheap, trading at just 11 times the Street consensus estimate for 2008. He's also bullish on Fairchild Semiconductor (FCS), which trades at 14 times this year's estimate and just 12 times next year's. And he sees opportunity in International Rectifier (IRF), which has been suffering through accounting troubles but which has $10 a share in cash -- about half its market cap -- and which Berger thinks will buy back stock aggressively once it completes a restatement. (Unless somebody buys the company, which he thinks is possible.)