Disney, for example, produces movies that parents can trust to be suitable for their young children.

No one can produce the videos of my robots I have.

The ultimate goal is to own a small portfolio of around 10 homes (current goal of 1 a year) that will produce good cash flow and leave me with a nice retirement plan.

There's nothing wrong with that deal, for your first that's a nice level of return, healthy challenge with renos & conversions, & not getting yourself too in over your head.If you're hiring a property management company for something that's 2-unit or less it's definitely going to be a bit more challenging from a cash flow perspective, that's just reality.  

One will most likely produce consistent, reliable mid-range returns over time, one could end up a major winner or major loser, or somewhere in between.

The goal was to compare their asking price, since I viewed it as a healthy comp to my property.

It would produce about $593  in net monthly cash flow, I would not have to put too much work into it, and since it is walking distance from a University it would consistently remain rented (I see this as the safer option).The Second: Is a fourplex which is currently 100% rented.

I've begun my direct marketing which has already produced a few promising leads and have been analyzing three properties a night to improve my ability to find a great deal.

These have historically more similar to bonds than real estate (and produced higher returns with less volatility than bonds).

What are your guys thoughts on what a "healthy" level of vacancy is for an asset?