In general, I'd try to keep things as simple as possible. If your plan is to have a three-fund portfolio (like Total Market, Total International, and Bond), and keep those three funds in general, then having it separated now and adding them all as you invest more is fine. (And upgrade to Admiral Shares once you hit the threshold for it.) Likewise, just putting it all into Total Market as suggested in another answer, or into something like a Target Retirement fund, is just fine too for that amount.
While I'm all in favor of as low expense ratios as possible, and it's the kind of question I might have worried about myself not that long ago, look at the actual dollar amount here. You're comparing 0.04% to 0.14% on $10,000. That 0.1% difference is $10 per year. Any amount of market fluctuation, or buying on an "up" day or selling on a "down" day, is going to pretty much dwarf that amount. By the time that difference in expense ratios actually amounts to something that's worth worrying about, you should have enough to get Admiral Shares in all or at least most of your funds. In the long run, the amount you manage to invest and your asset allocation is worth much much more than a 0.1% expense ratio difference. (Now, if you're going to talk about some crazy investment with a 2% expense ratio or something, that's another story, but it's hard to go wrong at Vanguard in that respect.)