Instead of choosing just one or two stocks, buy a bunch of quality dividend-payers with a single ETF.For income investors, the only thing better than dividend stocks are dividend exchange-traded funds (ETFs). With a dividend ETF, you get all the benefits of a dividend stock -- including a regular payout -- but you also have the advantage of diversification.Face it: Unless you are investing in a stock like Nvidia that's in the middle of an unprecedented run, it can be challenging to identify the best stocks ...