My retirement plan doesn't include a decent total stock market fund. The best it's got (among some truly horrible and expensive choices) is an Index 500 fund, albeit with higher fees than Vanguard's. (There are no decent bond or international funds at all, so we buy those through my wife's TIAA-CREF plan.)
I'd prefer to be buying a Total Stock Market index fund. I have room to rebalance in other retirement accounts. What Vanguard index fund do I buy to complement the Index 500 investment and approximate a Total Stock Market fund investment?