All I can say is be prepared for it to cost A LOT!
I think that is why many special needs mom's decide to stay home... it costs more to hire a nanny than they make.
That said, with the current recession, a lot of child care workers are desperate. So you may be able to find a "regular" nanny, and train them to handle your DC's needs, and pull your older child out of Kindercare for now. That is the direction I personally would go (unless I was independantly wealthy )