Since you guys are here to experience the liftstyle, why not place your kids in local schools? I know of a Capt from Silkair that used to have all his kids there. His kids' network of local and expat friends are somewhat more of an interesting mix.
If you haven't read much into our local education, i suggest you do a bit of reading up. Correct me if i'm wrong, in terms of standards, it is one of the better ones in the world. Why miss the chance to experience wholesale when you are already deciding on coming to Singapore?
IF i didn't remember wrongly, it will cost you 3.5k to 8k per year in a local or semi local school.
WLF