Adams Township, Middlesex, Valencia.
You want a 'burb outside Allegheny county because of taxes. Mars offers an excellent school, low taxes, high academic achievement, small classes, etc, yet in 20-25 minutes you can be in downtown. Still can get plenty of 1+ acre lots.
Me, I live here now, but as soon as my kids graduate, I'm heading back to the country where I can have 50 acres and no city nearby