My best advice is to work with a realtor who is also an investor and can easily plug you in with their systems and network of GCs, PMs, and lenders.

The system is very clear cut, making it simple to navigate.

All security deposits are held in the operating account but our accounting system keeps careful track of security deposits and they show up as a liability on our balance sheet.I've not heard of management software designed to function in a specific state, so presume any would work there. 

Super technical thinking going on with planning your system.  

I am wondering what the best software systems that are available to list my property on to get tenants, screen, application... etc. 

When I confronted them, they defended their quote, stating that they go off the industry standard and a portion of the labor time is for "testing the system after repairs to ensure safety."

My vote would be 531390,  Other Activities related to Real Estate.  

AND rush you into decision leaving very little time for you to investigate the risk involved with this request.My VOTE, proceed with caution.

Under the current system the commissions are just rolled into the price.The problem will be when an independent buyer wants to see a house but won’t sign a buyer’s agent contract because he doesn’t need an agent.  

This makes for a complicated system.