If you have some appetite for risk, this exchange-traded fund could be a great choice.It's a great time to be in the market. After some downward pressure earlier in the year, the S&P 500 is back in growth mode, and it's up nearly 11% year to date.Concerns still abound. Is the market overvalued? Is inflation really moderating? Will tariffs cause more problems for manufacturers and retailers? Is the market due for a correction, or worse, a crash?You can't reliably time the market, and there's no way to know w ...