We would need to know more about what type of special needs your kids have to be more helpful. However, I would first suggest consulting friends, internet forums such as this, internet forums for special needs kids, and websites for the schools you are considering. Then most importantly, meet with officials from each of those schools and tour the facilities that are available. Ask if they can put you in touch with parents of the kids they serve and see how those parents feel about the schools.
Best of luck to you.