What can I expect to pay for a nanny in Nassau for 3 kids?

I need to gather all the information I can to figure out what makes the most sense for us after baby #3.
Personallly, I much prefer a daycare setting to a nanny (unless it was someone who was personally recommended) but I am assuming daycare will run me about $800/wk and since I would only need someone 4 days (if not less if I can work out a PT situation) I'd imagine a nanny would cost less. But then I would also be paying for Ryan to go to nursery school.

Anyone with 3 kids have a nanny and can share with me?

If I return to work in say February, my kids would be:
a couple months shy of 4
2 yrs 3 months
4 months