Doha Academy is not a good choice I believe! I was a trecher there last year and I had my 2 kids there too....
I enrolloed them this year in HUBS(The building sucks but they are in the process of moving to a new one). great teachers (so far), canadian system, Islamic atmosphere (the principle in an american muslim).

P.M. me if you need further information...

Good luck and keep your expectations very low in Qatar...