I'm curious on specific neighborhoods and/or zip codes that fit my criteria and have the most potential for growth.

PHYSICAL CHECK = If you have permission you should physically check the property prior to the sale or have a professional inspector.

An overarching passive income managing agent, with tax and LLC/trust expertise would be the perfect fit. 

Tacking onto what @John Koster said, the POS ordinances can be tougher in certain cities than others and the tax rates in the burbs can turn a dream deal into a nightmare rather quickly.I'd find a knowledgeable agent who also invests and work with this person to learn the areas and see what fits your investing profile.

If you're seeking a reliable income stream, Cleveland would be a good fit.

Sometimes you may not fit the tight requirements of credit unions or banks.

Don't make your scope of work fit your budget.

A good agent can help you with strategy, listen, show you a path along with assist in finding properties that fit with the your goals.  

They also sell add-ons that allow you to accept cards instead of coins, but I don't know what machines they fit on. 

Pretty much every property I bought fit that definition.