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Why would a long-term investor ever chose a Mutual Fund over an ETF?
There is little difference between buying shares in your broker's index fund and shares of their corresponding ETF.  In many cases the money invested in an ETF gets essentially stuffed right into the index fund (I believe Vanguard does this, for example).  In either case you will be paying a little bit of tax.  In the ETF case it will be on the dividends that are paid out.  In the index fund case it will additionally be on the capital gains that have been realized within the fund, which are very few for an index fund.  Not a ton in either case.  The more important tax consideration is between purchase and sale, which is the same in either case. I'd say stick it wherever the lowest fees are.