Count me in as a fan of exchange-traded funds (ETFs). A significant percentage of my investment portfolio is invested in several ETFs. I especially like Vanguard's funds because of their low costs.

Vanguard currently offers 86 ETFs. Several of them are good picks. However, I think one stands above the rest. Here's my favorite Vanguard ETF to buy right now -- and it isn't even close.

If you asked Warren Buffett what his favorite Vanguard ETF is, he'd probably tell you he likes the Vanguard S 500 ETF. His Berkshire Hathaway portfolio owns this ETF. Buffett's will also stipulates the cash his family inherits be invested in a low-cost S 500 index fund. The legendary investor recommended Vanguard's.

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Source Fool.com