If you need some amount of money sometime within the next ~5 years, then parking it in a FDIC insured savings account is the most appropriate option commensurate with the amount of risk tolerable (i.e. none), in my opinion.
Approximately same security, higher yield than savings accounts. (Asuming you're not going through the gymnastics / risk to balance across reward savings accounts)
* VMRXX - Vanguard Prime Money Market Fund, ~2.4% yield, fully taxable
* VUSXX - Vanguard Treasury Money Market Fund, ~2.2% yield, no state tax
* VMSXX - Vanguard Municipal Money Market Fund, ~1.6% yield, no federal tax
* VCTXX - Vanguard California Municipal Money Market Fund, ~1.5% yield, no federal or California tax