So...
We live in an area where the public schools are excellent. The downside is that we pay property taxes that are through the roof. Here are some of our considerations about public school and why we chose not to send our kids to private school...
Consideration #1: Staying the same school system all the way through (public or private)
We moved to the neighborhood because we wanted to be where our kids could go to school with the same group of kids the whole time that they are in school. My oldest is a junior in high school...he is dating a girl that we have known since he was in kindergarten, so we also know her family. Same with most of my kids friends. We know them, and have known them since they were small. That's kind of nice...
Consideration #2: Outside of school the kids are in the 'hood because of where we live...
If we lived some where else, we could pay lower taxes and send our kids to private school, but then Tex Jr's best buddy wouldn't live down the street, he would probably live on the other side of town and just "hanging out" would be next to impossible. If your kids are in private school, while the rest of the neighborhood kids are in public. I know there are kids in my neighborhood who attend private school, my kids don't know any of them, unless they are kids who went to public school first. This also comes in handy when Jr has a homework assignment he needs to work on with someone else...that kid is just minutes away. And time is precious...don't think you will have more time once your kids are older and in school. You actually have LESS time, so not having to drive them back and forth to school is huge!
Consideration #3: Don't let the big picture fool you for public school systems...
Another thing about our 'hood is that the parental involvement is huge at the school. So that's something else to look for in a school, either way. That can have implications for individual schools, too. Our school district is pretty good, but the schools that my kids track into are the best in the district because the parents are very involved. So don't discount an entire district...look at individual schools.
Consideration #4: Extracurriculars...some of the best advice I have been given as the parent of a high-schooler is to make sure that your kid does at least one extracurricular activity...this will keep them out of soooo much trouble.
It has been my experience that the private schools (in our area, at least) don't have the same type of extracurricular programs. I know they might have some...but probably not to the scale that a public school might have. Our music and band program that begins in middle school is awesome. We have every sports team that there can be...swimming, tennis, soccer, football, golf. (We don't have lacrosse though which Mini-Tex plays, but that would asking a lot.) Then there are the clubs, FFA, FCA, Quidditch (seriously)... even the elementary school has a chess club, robotics.