Simply parking most or all of your long-term investing dollars in a low-fee, broad-market index fund such as one that tracks the S&P 500 is a great way to invest -- and even Warren Buffett has recommended that strategy for most of us. Less those low fees, it will get you roughly the same return as the market (as measured by the index it tracks). Great, right?

Well, that is great, but the stock market has averaged annual returns of close to 10% over long periods, and over your investing time frame, it might return a bit more or less. If you crave faster growth, and you're willing to learn more about investing and take on more risk, you might invest a portion of your portfolio in some carefully chosen individual stocks.

Here are three contenders for your portfolio, each of which may double your money in just a few years -- or perhaps a bit longer. (The stock market offers few guarantees, and slumps can happen at any time.)

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