Check out Yorba Linda and Fullerton as well. They're a little farther north, but the area is quite good.
Villa Park is more upscale with bigger homes.
The city of Orange can also be good. There's a great church, St. Paul's Lutheran, on Heim that has a private school going all the way up to 8th grade in addition to their pre-school.
Orange has a wonderful little downtown area with antique shops and a retro diner. They have art walks once a month and a big food fair every year. (Can you tell I lived in Orange? Hee hee!)
Generally, you'll want to be careful when you are looking in the city of Anaheim as the area's just outside the tourist belt around Disneyland aren't wonderful.
Most of the Orange County areas will have a Moms Club and there are lots of MOPS clubs as well. Both of them have websites where you can hook up with local clubs. Give one of them an email explaining your situation and see if they'll give you some info.
You can also get down into the beach areas of Huntington Beach, Dana Point, Balboa but they'll be more expensive.
When you go out, have an In-n-Out burger and visit downtown Disney. (the free part of the Disney resort) And have fun! Southern California has a lot to offer. It's not Austin, but it has it's own flavor that's just as unique.