NEW YORK ( TheStreet) -- In the wake of the 2008 financial crisis, uncertainty has gripped investors and alternative investments loom large. Some of the fastest growing ETFs belong to the commodities or emerging markets sectors, in which investors feel that they can find shelter from inflation, a hedge against U.S. markets, or high returns to compensate for losses over the past year. As U.S. financial markets drift back towards normalcy, however, a strong case can be made for tempering alternative investments with broader market exposure. Growth stock ETFs offer a different exposure than other broad-market funds, with outsized positions in health care, technology and consumer firms. While it is difficult to pinpoint a single sector in which growth stocks will flourish, ETFs offer both large- and small-cap exposure to growth stocks.