"A simple rule dictates my buying: Be fearful when others are greedy, and be greedy when others are fearful. And most certainly, fear is now widespread."
-- Warren Buffett, Oct. 16, 2008

It was a tough year for the world's richest man -- according to data from Forbes, Warren Buffett's net worth declined in value by a staggering $25 billion in 2008.

So let's not be too hard on ourselves if we, too, owned a few stocks that lost substantial portions of their value last year. Instead, let's pay close attention to what masters like Buffett are doing on the heels of such a dismal market year.

Let's cut to the chase
Buffett has been using the $44 billion cash hoard he had at the end of 2007 to buy stocks ... in the midst of an economic crisis.

Sure, Buffett may be insane, but as the world's richest man, his record speaks for itself. So when he wrote in that October New York Timeseditorial that he's buying now because it is likely that "the market will move higher, perhaps substantially so, well before either sentiment or the economy turns up," Fools would do well to take heed.

These opportunities
What opportunities might the Oracle see today? According to Berkshire Hathaway 's most recent 10-K filing, he's interested in buying companies at a fair price that have:

These criteria are designed to ensure that the stocks on Buffett's watch list are large, well-run, and understandable, and that they possess durable moats-- sustainable competitive advantages that allow a company to maintain high levels of profitability and growth over long periods of time. Those are the rare companies that you want to buy when they're cheap, then hold for a long time as they continue to grow and prosper.

To try to identify the stocks that may be populating Buffett's wish list, I built a screen based on these traits using Capital IQ, an institutional software database. My research turned up 57 stocks. Confirming that we're on the right track, several of the companies that popped up -- UnitedHealth Group (NYSE: UNH) and Johnson & Johnson are two examples -- are alreadyowned by Berkshire Hathaway.

Here are three more candidates:

Company

7-Year Annual Earnings Growth

Return on Equity

CEO Tenure

Industry

Analyst Coverage

BHP Billiton (NYSE: BHP)

20%

15%

2 Years

Mining

17

EOG Resources (NYSE: EOG)

66%

26%

11 Years

Oil and gas exploration and production

28

Bristol-Myers Squibb (NYSE: BMY)

6%

27%

3 Years

Pharmaceuticals

25

Data from Capital IQ, a division of Standard & Poor's.

But you can do better
Unfortunately, large companies attract lots of coverage from Wall Street analysts -- those 57 stocks have 24 analysts following them, on average -- which, as I've explained in an earlier column, makes them less likely to be mispriced. Even though Buffett's excited about all the opportunities he sees today, he's well aware that small companies offer greater upside.

So given that $30 billion Union Pacific (NYSE: UNP) is on the smaller end of Buffett's major holdings, why does he stick with such large stocks?

Berkshire's overall portfolio was more than $112 billion at last count, which means that any new investments Buffett makes will have to be big -- such as his $8 billion stake in Wells Fargo (NYSE: WFC) -- in order to have much of an impact on his bottom line. Only huge companies can support the kind of volume he brings to the table. So he has to look for the market's best large caps, rather than the market's best stocks.

He freely acknowledges this fact: 

Berkshire's past record can't be duplicated or even approached. Our base of assets and earnings is now far too large for us to make outsized gains in the future[original emphasis] .

Cue our sympathetic "aww" ...

Why Buffett may wish he had less money
Buffett once famously boasted that he would be able to earn 50% annual returns... but only if he had a whole lot lessmoney. Why? Because he'd be able to freely buy and sell small stocks that the hot shots on Wall Street don't adequately cover.

So if you're like me and have less than $95 billion to invest, it makes sense for you to look at some of the stocks the Oracle wishes he could buy -- small stocks.

If we strip away Buffett's $75 million pre-tax earnings requirement and focus on small caps, our list of candidates grows to 84. Better still, these companies have just seven analysts covering them on average, which increases our chances that Wall Street's missing something.

Here are three small-cap stocks that Buffett may wish he could buy.

Company

7-Year Annual Earnings Growth

Return on Equity Continued...