NEW YORK ( TheStreet) -- Searching for yield, investors have been racing to buy dividend-paying stocks.Favorite choices include AT&T ( T) and Duke Energy ( DUK), which both yield more than 4.6%, a rich payout at a time when 10-year Treasuries yield only 1.63%. Now some fund managers worry that high-yield stocks have become too rich. According to T. Rowe Price, a warning signal went off recently when dividend-paying stocks became more expensive than non-dividend payers -- a big change from the pattern that has held for past three decades. "A few years ago, it was like shooting fish in a barrel because all the dividend stocks were so cheap," says David Abella, portfolio manager of Rochdale Dividend & Income ( RIMHX). "Now you have to search for names that have been overlooked." In 1980, the non-dividend stocks in the Russell 1000 index sold for a forward price-to-earnings ratio of almost 15, as investors embraced technology and other growth sectors that paid no yields. In contrast, dividend payers only had a ratio of around 5 because utilities and other yield-rich sectors seemed to be stodgy choices with little growth potential. Throughout the 1980s and 1990s, dividend payers remained unloved. As recently as 2005, their stocks had a P/E of around 15, while non-dividend payers traded near 20. Then the financial crisis caused an upheaval. With investors seeking safety, dividend stocks fared better during the downturns that swept markets in 2008 and 2011. By June this year, dividend stocks sold for a multiple of around 15, while non-dividend stocks traded for a bit less than that. The overvaluation has become particularly pronounced for utility stocks. Utilities Select Sector SPDR ETF ( XLU) currently has a forward multiple of 15.8, compared to 13.8 for the S&P 500. Should you stay away from dividend-oriented funds? Not necessarily. But for safety, consider one of the top-performing funds that have been altering strategies to avoid buying overvalued stocks. A solid choice is T. Rowe Price Dividend Growth ( PRDGX). During the past five years, the fund returned 2.3% annually, outdoing 88% of large blend funds. These days portfolio manager Tom Huber is underweight utilities and REITs, shares that can yield 4% or more. Instead, he is emphasizing growing companies that yield less than 3%. His portfolio includes unloved retailers and healthcare businesses. "Companies with 2% dividends are not necessarily on the radar screen of investors who are primarily concerned about getting high yields," Huber says.