The Vanguard S&P 500 ETF (NYSEMKT: VOO) is one of the most popular investment options for index investors. And with good reason. Its low expense ratio and strong track record of tracking the index make it a great option for those simply looking to match the S&P 500.

This year, Vanguard S&P 500 ETF shareholders have been treated to a return of around 17%. But those returns were driven by just a handful of megacap stocks held by the fund. Meanwhile, the rest of the market has been roughly flat, and there are some segments that have been severely beaten down.

Before you start buying the Vanguard S&P 500 ETF or adding to your existing position, there are three other ETFs you should consider first. These ETFs track a part of the market that's been beaten down lately but has historically outperformed the S&P 500. And at today's prices, they look more appealing than ever.

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Source Fool.com