You would need around 250k p.a. to make it worth your while with 2 kids in Int'l school:-
3 bed condo
Intl School 50k (25k each including GST and ancillary expenses)
Income tax 35k
Food and Utilities 12k
Modest Car 20k including petrol etc.
Pension/Savings Contributions, lets say 15-20% of salary, 40k
Other living, entertainment, holidays, clothes etc etc 40k
And this is for living a middle class lifestyle commensurate with peers in U.S., Canada, Europe, Oz.
Bear in mind also that you will also need a deep bucket of cash to get started if the company is not paying - here are some rough ideas:
School registration fees 3k (1500 x 2 kids)
School 'security deposit' 10k (5k x 2)
1st terms fees 10k (5k x 2)
Condo security deposit 8k (4k x 2 months)
Condo rental up front 4k
So thats 35,000 Sing dollars just to get the keys to your home and for your kids to start their first day in school - this is without flight costs and other ancillary expenses - and I think these figures are quite conservative - ouch!