There will be a price to pay for short-term sleep when you have a conservative portfolio. A money market fund is doing just great right now, but it's not going to outperform anything else in your portfolio over the time periods that you're talking about. Or if you want an even more diversification, you could add something like Manage Futures for maybe five percent of the portfolio. But I hesitate to tell you to do that right now because Gold's at an all-time high.