You are right, it's low because of the school fees. Otherwise it's just OK, nothing to write home about. Do NOT count on any bonuses or anything else that's not in the contract. Do count on having emergency trips home, kids in schools that want you to pay for really expensive activities such as trekking in Nepal or safaris in Africa, and losing your wife's current salary. Local-hire expat wives make squat here. Also, do know that you would not get your kids into an American school here this fall. PLease know that the negotiating phase is the where you will be treated the best, if it ain't good enough, don't come.
Mandi