These market giants make great long-term investments.When the S&P 500 is soaring, it's easy to forget about the power of dividend stocks. You may be tempted to get in on high-growth names, the stocks that are driving the current momentum. And that might be a good move, especially if you're an aggressive investor looking for stocks that may double or triple in value. But this doesn't mean you should ignore the companies that will pay you just for owning shares.Whether you're an aggressive or cautious investo ...