One "gotcha" if you go with ETF's in a taxable account is that you have to keep very good records to determine your cost basis for capital gains calculation. Most mutual fund companies do this for you automatically for their mutual funds.

If you have a number of purchases and sales in addition to having dividends reinvested then the cost basis will be complicated to figure out 30 years from now. The records need to be organized so that if you are in a nursing home and not able to do it, then whoever is managing your money will be able to figure it out.

Greg