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."