Bright Light Early Learning Center is pretty good. My neice went there and she loved the teachers and the enviornment. There is also a Goddard School in CS, but it's a little pricier.
Pickering Valley Elementary has a great reputation. I am not sure if they bus from Chester Springs, but the Renaissance Academy in Phoenixville is a great school, it is free to attend, the kids wear uniforms, and they have an awesome curriculum. My daughter attended grades 4 through 8 there, and she went back into the public school at a grade level above everyone else. They really stress reading skills, have a great fine arts program, and divide the children by level on each class, in other words, if they are strong with math, they will be in a higher math class, but a lower reading if they need more help in that area. The teachers are all great, the class sizes are small and they have a strict behavior policy, which tends to eliminate the undesirables that cause problems in public school.
You could always check into it yourself, if they don't bus, but you are able to drive they will except your kids, they do have a waiting list so you might want to check into it soon. Good Luck...I love the pickering Valley, moved here ten years ago and love it!
Here is the school site:
www.rak12.org