Quote from piezoe:
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The Vanguard funds are quite safe, and in general have lower expense ratios than Fidelity funds. However, Fidelity's and Vanguard's MM funds are virtually equivalent, fund for fund. The Admiral funds have slightly lower expenses because they require higher minimums.
The real problem is that none of these funds denominated in US dollars is safe, because the money in them will lose buying power over time, and that's because of out of control "defense" spending in Washington. Bush's missiles in Poland! and three trillion dollar war, that you are paying for, are costing you big time in devalued currency. Maybe you should think about a MM fund denominated in Norwegian Krone. I don't believe Norway has any plans to place missiles in Eastern Europe.
Once Bush goes back to Texas permanently we may be better off. Until then, if we live in the US, we've got a problem.