Are you wondering if the S&P 500 is a good place to park your investment dollars? No less a sage than Warren Buffett says that the best retirement plan is to put 10% of your funds in short-term government bonds and 90% in an S&P 500 exchange-traded fund (ETF). As Buffet is one of the world's foremost investors, you could do worse than to take his advice. (See also: Warren Buffett's Investing Style Reviewed.)

The S&P 500 is perhaps the best depiction of the U.S. economy, covering all the main sectors and representing roughly 80% of the nation's market cap. It's not surprising that over $8 trillion of investor cash is tied to the equities that make up the index – over $3.2 trillion of which is in index ETFs. (See also: Index Mutual Funds vs. Index ETFs.)

Of course, not all S&P 500 ETFs are created equal. Some do a much better job of replicating the benchmark, and others do so at enviably low costs compared with their competitors. You've found your investment sweet spot when you discover a fund that manages to perform well at an attractive cost. (See also: The 10 Cheapest Vanguard ETFs.)

If you're thinking of moving some cash into an S&P 500 index ETF, here's a look at some top picks for 2017. Funds were chosen on the basis of a combination of year-to-date (YTD) performance, assets under management (AUM) and expense ratio. YTD performance figures reflect the period from Jan. 1, 2017, through November 2, 2017. For comparison purposes, the YTD performance for the benchmark index during that period was 15.23%. All figures were accurate as of November 2, 2017.

SPDR S&P 500 ETF (SPY)

  • Issuer: State Street Global Advisors
  • AUM: $241.41 billion
  • YTD Performance: 13.99%
  • Expense Ratio: 0.09%

While technically not an ETF (SPY is a unit investment trust, which are typically more tax-efficient vehicles than managed funds), this is the oldest of the S&P 500 benchmarked funds and by far the largest in terms of AUM. It is also extraordinarily cheap to hold, with an expense ratio of just 9 basis points, and it very closely tracks the performance of the benchmark index.

The fund is also extremely liquid, with a trading volume in excess of $14 billion per day, which makes it attractive as a tactical trading instrument as well as a buy-and-hold investment for fleshing out a 401(k). Returns are solid over the 1-year, 3-year and 5-year period, with gains of 18.50%, 10.69% and 14.09%, respectfully. (See also: How ETFs Are Dominating the Stock Market.)

iShares Core S&P 500 ETF (IVV)

  • Issuer: BlackRock
  • AUM: $126.49 billion
  • YTD Performance: 14.01%
  • Expense Ratio: 0.05%

If you're looking for straight-up S&P 500 exposure at rock-bottom prices, IVV is the fund for you. It's difficult to find a fund that delivers tight benchmark performance with such low holding costs. Of course, it can't come close to SPY in terms of volume, but IVV is plenty liquid for just about every class of investor, with over 3 million shares changing hands every day. It is also a true ETF, which means it avoids the cash drag inherent in a unit investment trust like SPY. Returns are strong over the 1-year, 3-year and 5-year period, with gains of 18.58%, 10.76% and 14.19%, respectfully. (See also: Yes, Investors Buy and Hold ETFs.)

Vanguard S&P 500 ETF (VOO)

  • Issuer: Vanguard
  • AUM: $72.19 billion
  • YTD Performance: 14.01%
  • Expense Ratio: 0.04%

With an inception date of September 2010, VOO is the newest of these three ETFs, but it's a part of Vanguard's well respected portfolio of funds. You might be tempted to wonder if there's really much difference between VOO and its primary peers IVV and SPY, and in all honesty, there's not a lot. Like its peers, VOO has low costs and high liquidity, and it offers the large-cap coverage you expect in an S&P 500 benchmark fund.

While the differences may be minor, they are potentially important. VOO only discloses its holdings on a monthly basis – not daily like IVV – which is a slight ding in terms of transparency. And VOO, unlike SPY, reinvests its interim cash. Returns are strong over the 1-year, 3-year and 5-year period, with gains of 18.54%, 10.77% and 14.17% respectively. (See also: A Look Inside the Vanguard S&P 500 ETF.)

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