The semiconductor sector continues to be a big winner.Investing in an S&P 500 ETF like the Vanguard S&P 500 ETF or the SPDR S&P 500 ETF (SPY +0.91%) can be one of the best financial decisions you make in your lifetime.After all, the S&P 500 has historically returned an annual average of 9% a year, and the broad-market index even beats most hedge funds most years. With its holdings diversified among the top 500 U.S. stocks, and a quarterly rebalancing to make sure that the collection stays up to date, the S& ...