We started by screening for funds that have outperformed their peers by the widest margins over the past ten years, using data from fund-tracking firm Morningstar. To make sure our choices would be easy to buy and affordable to own, we ruled out names that were closed to new investors and focused only on no-load offerings with minimum investment requirements of $25,000 or less. We also limited our picks to funds with expense ratios lower than the average for their category. Finally, we eliminated specialized funds, as well as those whose current managers were too new to be primarily responsible for the fund's performance record."