If at all possible, isn't the goal to have a warranty deed in order for the property to be most marketable or is all that we care about is if a title company will provide title insurance on the property? 

Verify the info they tell you about previous rentals and why they are moving by talking to past landlords (their second to last one will have more reliable info than the current one who may just want to get rid of them), doing a credit check (which will validate past address history), and checking court records for any landlord filings and judgments.  

What if you could buy a new home turnkey for $130-150k with a 5 year whole house warranty thus eliminating the need for CapEx and the upside of a 3-4% appreciation rate. 

First look at that. 2nd, I never allow tenants to perform work at or on the properties for safety and legal reasons.Have it done by a professional who has a license and insured, plus you get a warranty on their work. 

It's still valid too but gives you some relief toward the bankruptcy laws.

So keep that in mind and make sure you ask questions to actually validate the points brought up.

Do mold remediation companies offer any sort of warranty?  

I'm not sure of the validity of the exposure warnings.  

I'm going to validate my eligibility for proration.  

HOA's don't function as a type of warranty co., or on call repair service.