domain setup decision

All

my company have an exisitng forest name abc.my, that have 6 child domain running on mixed mode due to 1 of the child domain have abt 200 NT BDC server. i got new direction from management that we are expanding outseas, i need to create a child domain for each of the site, in addition i also need to setup OCS 2007. My headache is should

option 1 -create a new forest to cater for new child domain and slowly migrate the rest of the child domain of abc.my to new domain
option 2 - remain status quo that create any new child domain into abc.my and and slowly remove the NT4.0 BDC

Option 3 - similar to option 2, just that promote the child domain that have NT 4.0 BDC into its own Forest.