I used to roam the DFW area looking for good barbecue, but all of it fell far short of central Texas barbecue. Two places that have opened since I was there and are likely better than any of the places I went are Lockhart Smokehouse and Pecan Lodge. Sorry, I can't provide any first-hand experience of either place, but they're probably worth a try.
http://www.lockhartsmokehouse.com