An investor can put a third of savings dollars into each of those, rebalance when one gets ahead of the others by more than 10%, and otherwise essentially forget them till the account assets are needed. The rebalanced average would likely have given you pre-tax total returns through 7/31/14 of about 8.3% a year (for note that the rebalancing process involves buying more shares when assets are lower in price). By comparison, a buy and hold investment in the S&P 500 Index in the decade through 7/31/14 provided 8.0% yearly average returns, and was more volatile than this suggested mix.
Yet a small number of fund managers or specialty funds do seem able to win the competition with average market returns. To weed through them and pick ones the investor thinks likely to be winners going forward, a person might try these mutual fund sites: FINRA Fund Analyzer; NASDAQ Mutual Fund Comparison Chart; Scottrade FundCompare.
By first finding the best rated mutual funds, then looking over their ten-year and since-inception records for better than average results, and picking ones with reasonably low commissions and fees, I found these interesting candidates: