Downpayment amounts - 20, 25 or 30%?

[Felicia West]

Hello,

As a beginning investor, what down payment amount would you suggest if doing a traditional mortgage?  Of course, putting more down like 30 % would make it look like the property cash flows well, but is it worth it to put that much down, or is 20 or 25% down better depending on which gives you a better interest rate?  Thanks!