Tough one....some things I would be things are: (not necessarily for you to answer here, but somethings to think of!)

What sort of help would you get if he did take the job? Family, friends, childcare, nanny?
Will he ba able to be with you for your birth, and a bit of family time after (a few weeks?)
Will once a week visits be enough for your relationship, with a new baby too?
Is that extra money worth it, with air fares to come and go as well?
How much time does your DH spend at home now, will there be alot of difference?
What about the kids, how will it affect thier relationship with their Daddy?