Typically you can expect to net around 8% or better (after taxes, hoa and insurance) on a rental before leveraging your money. This number with a 20% down payment can easily reach the mid teens. (And the tax savings from the depreciation will be an added bonus).
We have some rented properties available (turnkey, no repairs, tenants already in place) for your comparing and even potentially your consideration.
Good luck with your investment goals.
Great to hear you are considering Houston as a place to invest in. I am working with several clients from out of state that believe the same as you and are wanting to put their money in property rather than the stock market. Houston is doing well still, and depending on your price range and investment goals would depend on the part of town you should look in. I invest personally in and out of Houston and have found some great niches in smaller towns outside of Houston proper. However, inside the loop always rents well and you can demand higher prices. Though, I feel the competition is a little more steep inside the loop than outside.