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.

Nick Vardy, editor of the Global Stock Investor, chose América Móvil (NYSE: AMX) as his favorite stock for 2007. It rose 39% as of 6/1/07. Here is Nick's original recommendation for AMX and his new favorite stock for the second half of 2007.

Updating his outlook on AMX, the advisor says, "Mexico-based América Móvil has been my #1 blue chip play on the global cell phone megatrend. The Latin American markets have been the strongest performing region globally. But even in that context, América Móvil has been a strong relative performer, handily outperforming the broader Mexican market, itself up 18%.

"And América Móvil has done more than make money for investors. It's also propelled controlling shareholder Carlos Slim ahead of Warren Buffett as the #2 wealthiest man in the world. If América Móvil's stock price continues its torrid pace, Slim will dethrone Bill Gates as the world's #1 by the end of the year.

"Should you still buy América Móvil? Absolutely! The stock remains a favorite of some of the world's top hedge funds. With Latin American cell phone penetration rates still hovering around 40%, América Móvil still only has one way to go -- and that's up.

"The stock is still a very good value based on a PEG ( price earnings to growth) of .58. Thanks to América Móvil's fast growth, this number has barely budged since I first recommended the stock in December."

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.

John Christy, editor of the Forbes International Investment Report, chose Nokia Corp. (NYSE: NOK) as his favorite stock for 2007, which rose 39% as of 6/1/07. Here is his original recommendation for Nokia and his current opinion on the stock.

For his new favorite stock, the advisor looks south of the border, recommending América Móvil (NYSE: AMX). He explains, "Latin America has been one of the hottest regions for global investors in 2007. As of May 25, the Morgan Stanley Capital International Latin America index is up over 17% in U.S. dollar terms.

"But there's still plenty of money to be made south of the border. AMX is the dominant mobile phone service provider in Mexico. The company's reach extends beyond its home market to more than 125 million subscribers throughout Latin America, with operations in more than a dozen countries.

"Revenue topped $21 billion last year, about half of which came from outside Mexico. The company is controlled by Carlos Slim Helú, who overtook Warren Buffett earlier this year as the world's second-richest man.