D.B.
I've heard a lot of good things about the Irvine school district. However my kids attend school in the Saddleback Valley school district (lake forest, mission viejo, rancho santa marg. ect.) and we've had a lot of excellent teachers.
You might look into public charter schools in the area. I know there is a nonsecular waldof school called Journey in Aliso Viejo (capistrano school dist). http://www.journeyschool.net/
And I know one family who raves bout Orange county educatioin arts academy charter school:
http://www.oceaa.org/English/index.html
hope that helps.
D.