Vanguard 500 vs Vanguard Total

[lamchau]

I am having a hard time deciding which one I should be investing in. I found two articles that defend for the Vanguard 500 and Vanguard Total. Also, what is DFA mentioned in the first article? I tried searching for it and got to the IFA.com website? Please clarify.

Pro Vanguard 500: http://www.fundadvice.com/fehtml/bhs...ies/0404a.html

Pro Vanguard Total: http://www.fool.com/News/mft/2004/mft04040811.htm