Each business day, TheStreet.com Ratings TheStreet.com Ratings compiles a list of the top five stocks in one of five categories -- fast-growth, all-around value, large-cap, mid-cap and small-cap -- based on data from the close of the previous trading session. Today we focus on mid-caps.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 60 factors. The stocks must also be followed by at least one financial analyst who posts estimates on the Institutional Brokers' Estimate System. They are ordered by their potential to appreciate. Note that no provision is made for off-balance-sheet assets such as unrealized appreciation/depreciation of investments, market value of real estate or contingent liabilities that might affect book value. This could be material for some companies with large underfunded pension plans. ManTech International ( MANT) provides technologies and solutions for mission-critical national security programs for the intelligence community, the space community, and various departments and agencies of the U.S. federal government. ManTech has been rated a buy since March 2005. Our rating is based on strengths such as the company's growth, efficiency, solvency, and stock performance. For the fourth quarter of fiscal 2008, the company reported revenue growth of 17.3% year over year. This growth outpaced the industry average of 13.9%, and appears to have trickled down to ManTech's bottom line, as EPS improved from 61 cents to 69 cents. Net income also improved, rising from $21.38 million in the prior year's quarter to $24.6 million. ManTech's debt-to-equity ratio is favorably low at 0.06, and along with this maintains a quick ratio of 1.44, illustrating the ability to cover short-term cash needs. A slight improvement in return on equity when compared to the prior year's quarter can also be considered a modest strength for the organization. As for ManTech's stock, its price has risen over the past year, reflecting the earnings growth and other positive factors cited here.