The one's I referenced are in your list, they are as follows, with expense ratios:
- S&P 500 (FXSIX) 0.05
- Extended Market (FSEVX) 0.07
If you really want to get fancy:
- International (FSIVX) 0.17
- Total Bonds (VBTIX) 0.06
Your average expense ratio after weighting your portfolio appropriately will be below 0.10
Sure, you can pick the target retirement fund, but you've already put in this much effort, you might as well save the 0.10 on your expense ratio. Here is an example of what I mean (this is just for example purposes, you can pick your own allocation of course):
80/20 stocks/bonds
stocks breakdown: 60 S&P/25 Extended/15 International
Weighted Cost:
Bonds: 0.012
S&P 500: 0.03
Extended: 0.0175
International: 0.0255
Total Expense Ratio: 0.085