Advantage/disadv. of all cash 30-50k SFM for rental property ?

[David Keller]

Newbie into real estate. Im in the process of securing a loan for the purchase of my first piece of investment property. Loan officer suggested i have up $70K in a heloc that i could use to purchase a house. What are the advantages/disadvantages with buying a low cost $30-$50k single family home in full rather than getting a bank loan paying 20% down. I clearly understand having as little as possible of my personal money involved/at risk is an advantage, but what are the other pitfalls or upside that i may encounter with heloc purchase rather than bank loan?