Investors shouldn't unthinkingly follow Buffett, or any other billionaire money manager, into Amazon or any other stock. However, Amazon is a top stock with robust opportunities trading at an attractive valuation, and if you have $500 available today, Amazon is an excellent choice.

Warren Buffett has generated tremendous gains for the long-term shareholders of Berkshire Hathaway over the years. The Berkshire Hathaway portfolio today features stakes in more than three dozen companies that were either selected by Buffett himself or one of his investing deputies.

The beloved consumer brand recently purchased by the Oracle of Omaha has skyrocketed by roughly 7,000% since its public debut 20 years ago.