Buy with cash & get a HELOC or only put 20% down?

[Lucas Cookson]

A property I'm looking at is about $65k. I plan to buy this property, and then continue to buy more properties once this one is rented, repeating the process over and over.

Would I be better off buying it with cash, and then getting a home equity line of credit (HELOC) to use as down payment for the 2nd house, or should I just put 20% down on the first house and take a regular mortgage for the rest?