Re schools, it baffles my why they show Uptown Mirdif. Yes I've heard good things about that school, but the pricing is ridiculous. If I were residing in Meydan, the first 2 schools I would seriously consider would be JESS Jumeirah or DESS. Both convenient to Meydan, both cheaper than Uptown and both with a more desirable reputation than Uptown. Lets make this clear before Uptown parents pounce on me, I am not knocking Uptown, but ask most people in Dubai what school they'd choose out of the 3 and most, without a doubt, would say JESS or DESS. There is also Safa school which is close to Meydan, heard good things about that one too.
Considering you have a 4th child, his/her schooling alone is enough to seriously hinder your savings on an FO package, not to mention medical. Should (god forbid) the 4th child need hospitalisation for something serious, then that could empty your bank account.
I don't like to be a scaremonger, but having a 4th child here, under no coverage from the company would make me seriously consider all my options.
All the best.