Don't rent to own. The laws in Texas are stacked against owners who have a contract to sell and a contract to lease a property that is more than six months in length. And the current market is very short on good homes. Therefore, any seller who is willing to consider a lease purchase doesn't have a saleable property or is trying to get more than the property is worth. If you can even find a seller who is willing to consider this, you will be paying more than the home is worth. Save your money for a downpayment. Get your credit in order and wait until you can qualify for a mortgage that will give you the power as a qualified buyer to negotiate the best deal possible on a great home.
If you are qualified now then get off the fence and buy. You may get in a bidding war with other qualified buyer for a short supply of good homes, but you will be investing in real estate when the market is making the turn back up and get the lowest interest rate you may see for years to come.