It's hard to beat dividend-paying stocks -- in part because they tend to increase their payouts regularly.So you've got $2,000 to invest -- or perhaps$20,000 or more. Where should you invest it? I'd like to suggest some dividend-focused exchange-traded funds (ETFs) -- funds that trade like stocks. Each is invested in a range of dividend-paying stocks.It's hard to beat dividend-paying stocks because healthy and growing ones offer three ways to profit:Their stock price will likely appreciate over timeThey wi ...