So my employer is going down to just 1 retirement provider and the choices are mostly crap (but thankfully a few decent Vanguard index funds). Ideally like most I would just want VTSAX however that is not available. I do have VFIAX, VIMAX, and VSMAX available. Expense ratios are .05, .08, and .08 respectively. I tried finding a listing of how much overlap there are and it looks like quite a bit (but if you have a great site/tool for finding that out I'll take suggestions as I didn't particularly like any that I found).
So should I just go with VFIAX and call it good or should I put some money into either of those others? I do have all my other retirement investments in VTSAX (so Roth and Rollover IRA's). Thanks in advance.