KJP,
I was in your shoes for a few years. Our DDs old school does not offer much of differentiation. Gifted program has pull out 3-4 hrs a week for probably 20 weeks in a year. When we look for different school districts, there was one with all schools (elementary to high school) exemplary rating which is very rare in Texas. It's exactly like your district A. It's in very affluent neighborhood and if you are not IN crowd, the school life could be difficult.
The other school district offers great Gifted programs with acceleration on all identified kids. (3-4 hrs a day for both Math and Reading in elementary, TAG or accelerated classes in Middle school and AP, dual enrollment in High school. They have different economic background and ethnicity as well. We decided with the latter. We wanted our kids to see the diversity, help or be helped during their school years and it will be their lesson in life.
I second NSG. Choosing High school is more important. You can supplement when they are up to 5th grade at home but yo ucan not supplement much when they start Middle and High School because of their (loads of )homework.
We are happy with our decision and I am sure you will be too.
