No. of Recommendations: 0
As pointed out there is a lot of duplication between the S&P500 index and the Total Market index. My suggestion would be to have a big chunk of the assets in the TSM which will give you exposure to the mid and small cap stocks and not use the S&P500 index. Then if you want even more exposure to smaller companies with perhaps a value tilt select additional index funds to get the asset allocation you desire.
Experts disagree on the amount of International exposure you should have. Your thought of 20% is perhaps on the high side but not unreasonable.
Even with 30 years to retirement I think you should have some exposure to a bond fund. Perhaps some where between 10 and 30% bonds should be considered.
You might also consider some of Vanguard's fund of funds or balanced funds like their Life Strategy or the soon to be offered targeted retirement funds.

Just my $0.02, and probably worth it,
Bob
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