In my view, Vanguard remains the exchange-traded fund (ETF) king. The company offers a long list of great funds covering a wide selection of categories, nearly all of which have very low expense ratios-- keeping more money in your pocket. But with so many ...

Wall Street doesn't always get things right, so investors shouldn't base their decisions solely on the predictions of any one analyst. But Tom Lee from Fundstrat Global Advisors is on a hot streak, with a series of very accurate calls over the last couple of years.

If you're looking to turn $250 monthly into $500,000, the Vanguard S&P 500 ETF (NYSEMKT: VOO) could be your ticket. Past results don't guarantee future performance, but they're worth looking at to get a sense of potential. Since the exchange-traded fund (ETF) was created in September 2010, it has produced impressive returns.