Republic Airways Holding Inc. (NASDAQ: RJET) is going shopping. Only a day after making an offer for ailing Frontier Airlines (OTC: FRNTQ), it has made a bid to nab Midwest Airlines from private equity firm TPG Capital. The offer consists of $6 million in cash and a note for another $25 million. If the private equity house takes the deal, Republic will get 100% of Midwest's equity and TPG's secured note of $31 million.

The $25 million in debt is convertible to RJET stock at $10 a share, which gives TPG a bit more upside from the transaction. The seller would also have the right to nominate a member of the buyer's board of directors.

Of course, Republic's CEO, Bryan Bedford, is upbeat about the prospect of buying Midwest Airways, saying it will "enhance the strategic positioning" of his company. Like the proposed acquisition of Frontier, Midwest would continue to operate under its own name, though the target's Boeing 717s would be replaced with Embraer 190s.

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.

David Fried, editor of the Buyback Letter, chose Big Lots Inc. (NYSE: BIG) as his favorite stock for 2007, which rose 39% as of 6/1/07. Please see his original recommendation and his current opinion on Big Lots.

Fried's new pick is SkyWest, Inc. (NASDAQ: SKYW). He explains, "SkyWest, the nation's largest independently owned regional airline, is a contract carrier for United Airlines, Delta Air Lines and, most recently, Midwest Airlines.

"Nimbler than the big legacy carriers and not burdened by their bloated labor costs, SkyWest has a steady earnings stream, good cash flow, and an attractive P/E of 11. Its reputation as an efficient, low-cost operator and as the best-managed regional airline in the business was enhanced with the 2005 acquisition of Atlantic Southeast Airlines, which made SkyWest a player on the national stage.

"Since the mid-1970s, SkyWest has grown from a company with annual revenue of under $1 million to a publicly held company with annual revenues of more than $1 billion and almost 15,000 employees. SkyWest is set for continued long-term growth.