Last December, over 100 stocks were featured in our Top Picks for 2007 report. Now, at mid-year, we turn to the 20 advisors whose picks showed the strongest gains to get an update on their previous picks, as well as a new favorite stock for the second half of the year.

Dylan Jovine, editor of The Tycoon Report, chose RadioShack Corp. (NYSE: RSH) as his top pick. The stock had risen 100% as of June 1, 2007. The advisor recommends selling the shares.

His new recommendation for the second half of 2007 is United Healthcare Group (NYSE: UNH). The advisor asks, "How can you tell the difference between a buying opportunity and a 'value trap'? One way to do so is to separate the behavior of the stock price from the strength of the underlying business.

"For example, if a company has a strong underlying business that continues to grow (even as its stock price shrinks under the light of scandal), the inverse action of the stock going down while the business 'goes up' tends to lead to a buying opportunity.

"One great example of this is United Healthcare Group. Under the taint of the options back-dating scandal, last year Wall Street punished the stock by sending its shares down by nearly 30%, shaving off close to $20 billion in stock market value for a scandal that is expected to cost the company roughly $1.5 billion in restatements.

Down from its 2000 high of nearly $100 a share to $20 in recent trading, Jason Jovine believes the time has come for long-term buy and hold investors to buy Time Warner, Inc. (NYSE:TWX).

The editor of The Tycoon Report asks, "This stock went down over 80% in the last seven years! What in the world happened?"

One primary factor was the market itself. Indeed, we all remember the bear market phase beginning in 2000. Another factor was its sector. Jovine notes, "Anything related to technology had led the market to its peak in the 1990's, and anything related to technology from 2000 on was to get severely punished regardless of the company or its earnings."

In addition, the advisor points to the merger with AOL as part of the problem. "This merger was announced near the stock's high," he explains. "After that, of course, we had the terrorist attacks on 9/11 and the accounting scandals which later followed."

Now, however, he sees the company's problems as being in the past. He says, "I believe that the stock has been punished enough and is now a very good buy."

He notes, "Overall revenues last year rose by over 4%. In their family of companies -- including AOL, HBO, Time Warner Cable, Turner Broadcasting System, New Line Cinema, Warner Bros. Entertainment, and Time Inc. -- the growth mainly came from Time Warner Cable and their networks, where revenues increased 34% and 7% respectively."

Meanwhile, he points to the stock's price to earnings ratio at about 12.5. He says, "Just as a point of comparison, Comcast (NASDAQ:CMCSK) has a p/e of about 32. In other words, you are paying a lot more for the earnings of Comcast than you are for Time Warner's. I know that they do not have the same exact business models, but I still believe that Time Warner is undervalued at this price, and the comparison is still valid."

As to future prospects, he adds, "I think that Time Warner will either exceed or come in on the high end of their earnings projections when their next earnings announcement comes out in early May; stay tuned."

The stock, he concludes, is best suited for those with a long-term horizon. He says, "In my view, investors should buy the stock and hold it. This is an investment."

For more stock picks from the leading financial newsletter advisors, visit Steven Halpern's free website, TheStockAdvisors.com.