One is a turnaround, and one is just getting started. Both offer long-term opportunities.The rise of artificial intelligence is sending many top stocks to new heights, and they're taking the broader market along for the ride. The S&P 500 is up 16% year to date, and it's being led by AI-flavored names like Nvidia and Amazon.The movements of the market are always a balance. Investors love a strong bull market, but an overvalued market makes it harder to find bargains and could lead to a correction. But even a ...