Sorry to burst your bubble but 25000 /month is just enough to get by in Doha these days. Doha is extortionately expensive .  After realistic expenses you are looking at saving  nothing to a pittance. Forget about the tax break. That will be eaten up by your landlord. Ah but yes there is one and only one thing inexpensive - GAS !  Knock yourself out and get a Hummer if you come.