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Vanguard Mutual Funds — Diversification vs Share Class
If I were in your shoes I'd probably take the Vanguard Total Market fund with Admiral shares, then worry about further diversification when there is more in the account. Many times when you "diversify" in to multiple funds you end up with a lot of specific security overlap.  A lot of the big S&P 500 constituents will be in all of them, etc.  So while the 10 or so basis points difference in expense ratio doesn't seem like enough of a reason NOT to spread in to multiple funds, once you split up the money between Large, Mid, Small cap funds and Growth, Value, Dividend funds you'll probably have a collection of holdings that looks substantially similar to a total market fund anyway. Unless you're looking for international or some specific industry segment exposure and all of the money is going to equities anyway, an inexpensive total market fund makes a lot of sense.