Like many investors, I love dividend stocks. Rural lifestyle retailer Tractor Supply Company (NASDAQ: TSCO), discount chain Dollar General (NYSE: DG), and equipment-rental company United Rentals (NYSE: URI) are three companies that pay dividends that I believe can also be better-than-average performers over the long term -- let's say over the next five years. What basis do I have for believing these three dividend-paying stocks could outperform the stock market average over the next five years?