1) The commute is exactly 30-45 minutes depending on traffic. Fridays are usually more like 45 min.
2) The schools are great. Just realize that Carlsbad is split into three districts. 1) Carlsbad 2) San Dieguito and 3) San Marcos. The homes tend to be cheaper in the San Marcos school district so be aware of that. I know the general district lines but not well enough to list them.
3) Carlsbad is one of my favorite areas and is great for kids. I think the areas you listed above are all great. I personally would choose those areas over the northern part.