Package expectations

Hi there,
We are a family of 4, currently in middle East. My wife and I and two toddlers who will be starting pre-school soon. I'm from Europe, wife is from Russia. I've been offered an opportunity in Kuala Lumpur, and I've been told to name my price.

In Dubai, we have free school spaces for the kids, annual flights for all and insurance too, as well as living in a good area near the beach. We have a good salary and a comfortable lifestyle (we get a good holiday once a year, and enjoy a good shopping session, and eat out in a few times a week) In addition, I get a month's salary for every year I work as a gratuity when I leave.

All I've been told is that company will provide accommodation then move to an allowance after a year, and kids places are covered at school. My wife will take entry level position with me too.

For a comfortable western expat lifestyle, what is the ballpark amount I should ask for? How much allowance and what other clauses should I insist on to have similar living standard to now?