I think you have a super healthy view of this dilemma through your experience. As a person who has experienced the worst Down's has to offer with a very close relative, i can't imagine a happier thing they could have told my mother than, "your child doesn't have to be born with down's syndrome".

Due to religion, terminating the pregnancy was never an option, so a set of cosmic dice was spun in how positive or negative this experience would be. Let me tell you right now, I wouldn't wish my family's experience on anyone, and that breaks me apart to say more than I'm willing to admit.