It will probably be a whole lot easier to choose the asset classes you want, and how much of each asset class, before
you go choosing funds/etf and where to hold them.
For an example, Roger Gibson gave this example of an Investment Portfolio Design Format
. For example, how much of a small cap tilt, or possibly value tilt do you want? Do you want to include commodities? etc.
And then once you've decided on the %'s of each asset class, you can compare ETF's at M* ETF Screener
Personally, I don't think you need to use ETF's or a brokerage account in the IRA, since you can get similar index funds for tax inefficient asset classes like bonds, REITS, small value, etc., for no extra fees [brokerage maintenance fees] and no commissions when you buy or sell directly from someone like Vanguard.