For you investing gurus out there, can I get your take on this? I want to invest in a Vanguard total stock market index fund. In my case, the choice is fairly simple. Either:
VTSMX (Total Stock Market Fund, Investor Shares): $3,000 minimum investment, 0.18% expense ratio
or
VTSAX (Total Stock Market Fund, Admiral Shares): $10,000 minimum investment, 0.06% expense ratio
Here's my question: would it be more advantageous if I simply dump $10K from savings into the Admiral Shares fund, in order to immediately take advantage of the lower expenses? Or do I start with the Investor Shares fund, then add to it over a period of time (maybe 6 months or a year), in order to lessen the potentially bad move of dumping money into an overvalued bull market? I believe you can convert to the lower expenses Admiral version for no extra charge once you reach $10K mark in the VTSMX account.
Either way has its benefits and drawbacks, as I see it. Am I framing this correctly? I've got the $10K in cash sitting here basically wasting away in savings, ready to pull the trigger at any time, and I've narrowed it down to these funds, but I want to think about investing strategy before I go forward with it.