take a look in GGD job section. 600-650 is too low. They will complaine. But I personally think 800 is too high.. well, this is life. I think most of new mother will choose to work 2-3 days and for that 2-3 days, give the baby to day care.
I will worry double if I hire somebody take care of my kids and have fully access to my house without an legal agency.