TheStreet.com Ratings: Top 10 Mid-Cap Stocks

Each weekday, TheStreet.com Ratings compiles a list of the top 10 stocks in five categories -- fast-growth, all-around value, large-cap, mid-cap and small-cap -- and publishes these lists in the Ratings section of our Web site.

This list, updated daily, is based on data from the close of the previous trading session. Today, we look at mid-cap stocks. These are stocks of companies that have market capitalizations of between $500 million and $10 billion that rank near the top of all stocks rated by our proprietary quantitative model, which looks at more than 62 factors.

In addition, the stocks must be followed by at least one financial analyst who posts estimates on the Institutional Brokers' Estimate System. The stocks are ordered by their potential to appreciate.

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Today begins with Watson Wyatt(WW Quote), a human resources consulting company. It has been rated a buy since March 2005. The company's strengths include steady revenue growth, solid stock price performance, impressive increases in net income and a compelling record of EPS growth.

These strengths outweigh the company's weak operating cash flow.

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Oil and gas transportation company Oneok Partners(OKS Quote) has maintained a buy rating since June 2006. The company has recently acquired valuable natural gas and processing assets that reduce its dependence on regulated fee-based transportation revenue.

Oneok shows impressive revenue growth, and superior return-on-equity that is significantly higher than that of the industry average. It also has enjoyed impressive net income growth.