I have fully funded my Roth IRA for the year and plan on putting $100 every two weeks in my companies vanguard Roth 401k. I am currently only working at this clinic till I get into graduate school then I will be leaving so I will only be working here for around 5 more month or if I don't get in this round a year and 5 months. So my 401k will be closed and I'll have to decide what to do with the money then. But in the mean time I'm trying to decide if it would be best to put my $100 every two weeks into VINIX (vanguards institutional index that mirrors the S&p500) or VPMAX (vanguards prime cap index). I was curious how bogle heads thought about VPMAX vs VINIX (I am only 23 so I can leave that money for a while and likely won't need it any time in the near future