I agree with normal. No kids - i.e. coming as a couple or single, is a vastly different thing IMO (In my opinion). $150k as a single guy would be fine.
I know parents with no car and it is a pain. Soccer and other kids's activities on the weekends, grocery getting, trips to the doctor etc., etc. are all more complex without a car. Don't get me wrong it is totally doable. But if you have a car now, or likely 2 like most Americans, it will bug you not to have one.
My son goes to SAS. I won't get into the comparison debate about local vs. SAS vs. any other school. There are 3,300 kids in SAS, the quality of education and activites is top drawer, I just wouldn't compromise on schooling for my kids to go to any foreign posting.