Some excellent figures, the only thing we found dramatically different was the school fees. No, our kids didn't go to Gems World Academy either.
Depending on what school your children attend or where they can get a seat, what grades/year they are in (in the lower years - FS2-Year 6, EK covers considerably less yet some schools charge the same no matter what year/grade your child is in), and whether or not they take the bus, the fees can vary dramatically. I remember when we first came here our school fees were well over 40,000 dhs per year with two kids in school at that time.
With that said, if you have kids, you might want to research exactly what school you would like your children to go to, and what the actual costs are going to be...provided they can get a seat there. Good luck!