Have had friends who went to Stella Maris and have sent their kids to Stella Maris also, hey were very happy there. From what I could see of it, they had a very caring family atmosphere there.
God I remember going through this with my guys, its hard eh.
Check out the areas you are going to be wanting to live in and maybe then contact the schools by email to get a feel for them.
All the best.
Our daughter is starting Cardijn College (High School) in January 2010, it's down south in Noarlunga and the fees are about $4k per year. We liked the Headmaster and the Head of English when we met them and were impressed by the kids that showed us around on the open day, also our neighbours know a Tech teacher there and they speak highly of the school. Apart from that I can't give an ojective opinion about what the school is like on a day to day basis as she hasn't started there yet.