Don't get me wrong -- I love the S&P 500. It's a curated stock market index comprised of around 500 of the biggest, most profitable U.S.-based businesses. With that in mind, there are always great long-term investment opportunities to be found in this pool.That said, 500 companies is just a drop in the ocean when it comes to the stock market. There are quite literally thousands and thousands of stocks to choose from. And many outside of the S&P 500 provide life-changing gains.So, in this article, why not br ...