As a Buyer, YOU need to be careful as to what kind of Rent w/Option you are getting into.
Unless a Purchase Contract is made at the same time so the:
Date of Sale
Amount of Rent to be applied to House
and numerous other conditions are spelled out in a contract
You could very well end up in a situation where you wasted time and money.
You should work with an Accredited Buyer's Agent to insure your interests in the deal are properly represented and you will need a Real Estate Attorney as well.
Let me know if I can be of any further assistance with your home search.
Larry Jensen, Principal Broker
St. Lawrence Properties, LLC