Priceline.com

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First up is online travel site Priceline.com ( PCLN). 2013 has been a blockbuster year for Priceline. Shares of the $48 billion name have rallied more than 50% since the calendar flipped over to January, coming to within grabbing distance of the $1,000 per share level along the way. That momentum should play a big role in PCLN's upside ability for the rest of the year.

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Priceline dug out an economic moat by becoming the most popular "Name Your Own Price" travel site, connecting bargain-conscious consumers with excess inventory that hotels and airlines were trying to fill at lower prices. The firm has some big growth opportunities in international markets. As travelers abroad embrace travel sites (particularly in emerging markets like Asia and Latin America), Priceline's revenue has been steadily climbing higher. Priceline's experience in the U.S. market as a travel aggregator gives it a leg up over foreign competitors trying to establish the same business overseas.

Competitive advantages are hard to come by in more mature markets. That's why Priceline acquired Kayak earlier this year. The purchase gave PCLN a travel media site that serves as a stronger online destination than a commerce site alone, a key to capturing travel shoppers' eyes.

With rising analyst sentiment in shares of Priceline this week, we're betting on shares.

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