Good investment vehicles for cash reserves when starting out?

[Geoffrey Birkemeier]

I am just starting to read up on rental property investments. My current plan is to educate myself throughout this year and try to to acquire my first property by the end of this year or beginning of next.

Currently, my investment mix is maxing out my employers 6% 401k match, the annual contribution limit of $6000 to a ROTH-IRA, and investing the rest into a mutual fund.

What investment vehicles have you had success with to hold onto your cash reserves while accruing interest and maintaining liquidity?