Hognose would be my choice. Sand boas aren't very active and spend most of their time buried in substrate. KSB are nice snakes, but I think you will enjoy the hognose much more. Plus, they do things that are pretty cool. First time you see a hognose play dead, you'll be sacred to death. You're sure the snake is dead, then you come back in a few minutes and the little guy is crawling around like nothing happened. They are cool snakes!