Are you British? Jebel Ali has a good school w/ English national curriculum...been in operation for ages. Springs....maybe someone else on the board can jump in, but isn't Dubai International academy (IB) located near there? Also a good school.

I can't comment on the prices of those models, but 2nd hand cars are a good deal. Your transportation allowance is a decent chunk. I think that salary will go far given your situation. Good luck!