The S&P 500 index's year-end rally could give these promising stocks a nice boost.The S&P 500 index recorded impressive gains of 20% so far in 2024 to hit a level of around 5,740 points as of this writing, and the good news is that certain Wall Street analysts believe that the index could end the year on a stronger note.Financial research and advisory firm DataTrek Research expects the index to hit the 6,000 mark soon thanks to the Federal Reserve's rate cuts and the strength of the U.S. economy. Meanwhile, ...