San Antonio has some remarkably good schools. Texas has no county zoning, and many subdivisions outside the city limits have no controls on land use. Look for evidence that the CCRs are being enforced when you look for a home. Fringe suburbs like New Braunfels, Helotes, and Boerne were big losers during the bust of the late 1980s, and they have been slower to appreciate in the current boom. Don't assume this is your last move.
People now move as their lifestyle changes.
The average time between moves is less than seven years. The amount of money you spend to make a home just the way you want is inversely related to the length of time you actually live in it. In spite of this rule, most people overspend and overcustomize when building. You can profit by their mistakes. Look for the resale home that some poor guy poured his heart into, only to get transferred to Des Moines six months after he moved in.