At The Motley Fool, we're putting our money where our mouth is. In our "11 O'Clock Stock" series, we're giving our best analysts the task of recommending 50 great stocks across 50 days. The best part of it all? We're investing $50,000 across the picks. In the second week, we've picked a number of great companies across several industries. To follow the series, come back to at 11 a.m. ET every weekday. Can't make it at 11? We'll keep the day's buy in our Top Stories section 24 hours a day.

Here's a recap of the second-week selections:

Altria (NYSE: MO): Senior editor Anand Chokkavelu recommended the ultimate "sin" stock. While Altria may face uncertain litigation risks, the company also pays a generous 6.3% dividend and produces strong cash flow. Though cigarette use may be declining, Altria has strong brands that allow it to collect a large premium over lower-cost competitors. Click here to see Altria's buy recommendation.

EnerNOC (Nasdaq: ENOC): Stock Advisor analyst Matt Argersinger staked his recommendation on the need for innovative solutions for an energy grid that's stretched to its limits. EnerNOC provides demand response solutions that can meter power from its customer sites and scale back power during periods of sudden surges in demand. With an estimated $2.4 trillion needed to prop up North America's power infrastructure by 2030, Argersinger sees smart grid solutions like EnerNOC's as a smart bet for your investing dollar. Click here to see EnerNOC's buy recommendation.

Ultra Petroleum (NYSE: UPL): Natural gas has been in the doldrums recently. In fact, prices are so low that many producers can't extract the gas at a profitable level. Under these conditions, Motley Fool Hidden Gems analyst Michael Olsen believes Ultra Petroleum looks attractively priced with a bright future. The company has among the lowest costs of production in the industry, and because many expect natural gas prices to climb in the coming years, the company's fortunes should climb as well. Click here to see Ultra Petroleum's buy recommendation.

Allegiant Travel (Nasdaq: ALGT): Maybe the only thing people are afraid of more than air travel is investing in the industry. Their fears are well-founded, because airlines have traditionally been value destroyers. However, Rule Breakers analyst Sean Sun says Allegiant Travel has a winning formula in the industry. While other carriers target business travelers, Allegiant looks for routes with little competition that are mostly used by vacationing customers. Cornering this niche has allowed the company to produce industry-leading profitability and returns on capital. Click here to see Allegiant Travel's buy recommendation.

Vistaprint (Nasdaq: VPRT): Talk about an unfair beatdown after earnings! Vistaprint's recent earnings report sent the stock crashing 36% in one day. However, Stock Advisor analyst Andy Louis-Charles thinks the stock is well-positioned for the future. Since 2001, Vistaprint has grown at a 69% compounded rate. While that rate is slowing as the company grows, Louis-Charles believes investors buying in at today's depressed share prices will be well-rewarded. Click here to see Vistaprint's buy recommendation.

We've still got eight more weeks of picks to go, so keep coming back to "11 O'Clock Stocks" is fun, it's free, and we're investing along with you. So come back every day for a brand new pick.

Eric Bleeker doesn't own shares of companies listed above. EnerNOC and Vistaprint are Motley Fool Rule Breakers picks. The Fool owns shares of Altria Group, EnerNOC, Ultra Petroleum, and Allegiant Travel. Try any of our Foolish newsletters today, free for 30 days. The Motley Fool has a disclosure policy.