Now purchasing a home with cash is always good b/c obviously cash is king but also I think the part you might've missed is that, the money your utilizing on these home's won't actually be yours, but the banks or whatever institution you used to fix the home or make its value worth more.

Also, if you buy using a hard money lender or cash, Zach Starnes can do re-fi's off the appraised value shorter than the typical 6mos and then you might not need any money down if you buy at the right price.

They all cash flow and are easy to manage (so far).

Are you looking for cash flow/appreciation/a little of both?

A question I have is, if i rent out the main unit that has 4BD-2B, is it better to get a long term renter with steady rent payments from them or rent out for airbnb?

What's the projected cash flow? 

Question is, if I have the means to put a high enough down payment on a house to be cash flow positive (assuming my expense estimates are accurate, etc.) is that something that I should do?  

The Numbers:Cash Flow Analysis: Investors typically look for properties that will generate positive cash flow—meaning the income from rent covers the property’s expenses (mortgage, taxes, maintenance, etc.) and then some.

If you are on cash accounting, yes you could do that.On the other hand, you are ignoring carry-forward losses. 

At the most basic level a good deal makes you money with minimal cash and effort.