Welcome to San Diego, Angel!
There are many private schools from which to choose. You can use the Great Schools link I provided to start your research (you can reach me via my profile if needed). Since your kids are in middle and high school, just uncheck the boxes on the left of the web page for preschool and elementary.
I've read that some parents like the Horizon schools (Christian), Francis Parker and La Jolla Country School. But, there are some really good public schools here too, so don't rule anything out until you do some research, and talk or correspond with other parents.
Let me know if you have any other questions regarding your move here. I know Encanto well, and the many other neighborhoods and cities here in San Diego.