Which of these vanguard funds should I choose?
As others have said, it really depends on your risk preferences. Unfortunately a few of the funds in the list didn't exist until late 2010 so they're a bit difficult to evaluate. However, I put together a quick list of their performance (annualized average monthly return) and downside risk (downside deviation of monthly returns with Minimum Acceptable Return set to zero) from January 2011 to yesterday's close. These numbers assume dividends are reinvested, and the money market fund is left out since it's essentially like holding cash:
Fund Annualized Growth Downside Deviation (monthly)
VBMPX 3.51% 0.89%
VWNAX 15.31% 3.58%
VIIIX 15.02% 3.53%
VEMPX 15.87% 4.39%
VTPSX 5.81% 5.02%
For example, since 2011 VIIIX has averaged approximately 15% per year in returns, but during "down" months has tended to lose about 3.5% of its value (though the latter statement is a bit of an oversimplification). By these metrics it looks like VTPSX is the only real stinker in the group, but again the time across which they can all be compared is pretty short to say much. Just for comparison, the returns for VTSAX over the same period are 15.16% and the downside deviation 2.12%. Hope that helps you figure out what you want to do.