The funds in our "Magnificent Retirement Mutual Funds" list are among the best managed and best performing mutual funds available. If you are just finding out about our Top-Ranked Funds list, we welcome you!

The easiest way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. Using our Zacks Rank of over 19,000 mutual funds, we've identified three outstanding mutual funds that are ideally suited to help long-term investors pursue and achieve their retirement investing goals.

Let's take a look at some of the highest Zacks Ranked mutual funds with the lowest fees.

Goldman Sachs Strategic Growth Institutional (GSTIX Quick QuoteGSTIX - Free Report) : 0.76% expense ratio and 0.71% management fee. GSTIX is a Large Cap Growth option; these mutual funds purchase stakes in numerous large U.S. companies that are expected to develop and grow at a faster rate than other large-cap stocks. With annual returns of 14.57% over the last five years, this fund is a winner.

JPMorgan US Equity Fund L (JMUEX Quick QuoteJMUEX - Free Report) : 0.55% expense ratio and 0.4% management fee. JMUEX is part of the Large Cap Blend section, and these mutual funds most often invest in firms with a market capitalization of $10 billion or more. By investing in bigger companies, these funds offer more stability, and are often well-suited for investors with a "buy and hold" mindset. JMUEX, with annual returns of 10.88% over the last five years, is a well-diversified fund with a long track record of success.

Neuberger Berman Guardian Trust (NBGTX Quick QuoteNBGTX - Free Report) : 1.05% expense ratio and 0.9% management fee. NBGTX is a part of the Large Cap Value category, and invests in equities with a market capitalization of $10 billion or more, but whose share prices do not reflect their intrinsic value. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 12.15% over the last five years.

So, there you have it - if your advisor has you invested in any of our "Magnificent Retirement Mutual Funds," they are certainly earning their keep. If not, you may want to look elsewhere.

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Investing in underperforming mutual funds is just one of the key errors that can derail your retirement plans.

To learn more, read our just-released report: 9 Retirement Mistakes You Need to Avoid.