It's really nice to hear others extolling the virtues of your choices. We believe that the two best mutual fund companies are Vanguard and Dimensional Fund Advisors (DFA). They both offer low-cost passive products. Vanguard works well for do-it-yourselfers, while you need a firm like ours to help you build wealth with a fund like DFA.
Despite needing an advisor to help you create and manage a DFA portfolio, they have managed to grow into one of the largest fund families in the world. Some of the reasons can be found in articles like this one from Morningstar: