Considering that their note is close to the asking price, I doubt that they would entertain a lease to own option. Lease to own scenarios in Texas have always been highly written in favor of the owners so the laws have been changed where Realtors cannot write them anymore. The buyer and seller have to hire an attorney in addition to all the other costs incurred. Too many buyers lost their downpayment in these transactions.
I would suggest that you look into renting strictly and if you decide to purchase a home, you can approach the owner and make a deal. That way you are not tied into the house and you don't have to consider losing your downpayment.