if you are willing to do a bit more work, you could slightly smooth out the wild ride and possibly outperform over time by adding 10-25% in bonds. If you do, about once a year you will want to rebalance your funds to maintain your chosen allocation. You might also want to rebalance any time the market makes a major move (20%+) up or down. This means you will sell shares in whichever asset class has performed better and buy shares in the one that has lagged.
