Ara Jo we invest in buy and hold here in San Antonio. We target the $1100-$1600 rents and ARVs of $120K-$200K.
This should keep you in decent areas.
I understand why you look at schools and crime but you need to focus more the quality of tenants and the ability to keep a property rented longer.
There's a lot to cover about SA but I hope this helps. Let me know if you want more info or help.