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, most reliable way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. Our Zacks Rank covers over 19,000 mutual funds has helped us identify three outstanding options that are perfect for any long-term investors' portfolios that is retirement-focused.Let's break down some of the mutual funds with the highest Zacks Rank and the lowest fees.If you are looking to diversify your portfolio, consider Goldman Sachs Strategic Growth A (GGRAX). GGRAX is a Large Cap Growth mutual fund, and these funds invest in many large U.S. firms that are projected to grow at a faster rate than their large-cap peers. This fund is a winner, boasting an expense ratio of 1.14%, management fee of 0.71%, and a five-year annualized return track record of 12.91%.JPMorgan Mid Cap Growth Fund R2 (JMGZX). Expense ratio: 1.49%. Management fee: 0.65%. JMGZX is a Mid Cap Growth mutual fund. These mutual funds choose companies with a stock market valuation between $2 billion and $10 billion. This fund has managed to produce a robust 11.74% over the last five years.Putnam Global Technology R (PGTRX): 0.68% expense ratio and 0.62% management fee. With a much more diversified approach, PGTRX--part of the Sector - Tech mutual fund category--gives investors a way to own a stake in the notoriously risky tech sector. With a five-year annual return of 24.75%, this fund is a well-diversified fund with a long track record of success.There you have it. If your financial advisor had you put your money into any of our "Magnificent Retirement Mutual Funds," then they've got you covered. If not, you may need to talk.Do You Know the Top 9 Retirement Investing Mistakes?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.This report can help you sidestep these costly mistakes and potentially achieve your retirement goals. Get Your FREE Guide Now Get Your Free (GGRAX): Fund Analysis Report Get Your Free (PGTRX): Fund Analysis Report Get Your Free (JMGZX): Fund Analysis Report To read this article on Zacks.com click here. Zacks Investment Research