If you plan on hiring someone, I would call around locally and see what ideas landscapers in Austin have. More than likely, they've dealt with similar situations and know which plants work best for your situation. I can tell you what we use in he Coastal Bend area, but even though we're only 180 miles apart, it may not work for you.
Also, just like mechanics, landscapers don't really appreciate the homeowner telling them what to do to alleviate a situation--that's why we have the education and the background and why you pay us to take care of your situation. Your ideas should be heard to get an idea of what you're interested in. If you want it done right, research your prospective landscapers prior to hiring anybody--ask for references and a portfolio of work. Unfortunately because we don't have to be licensed in Texas, it opens the door for anybody to say they're a landscaper.
The Austin area is loaded with good landscapers. Try calling some of the reputable garden centers around there to find out who they recommend. Ask your neighbors who they used. Visit the TNLA website at
Texas Nursery & Landscape Association- advocate for growers, landscape contractors, retail nursery & allied green industry businesses and visit the member directory. You should be able to find Austin landscapers through the search parameters.