Not sure where you got your salary figures from, but there is a common jet salary. I.e. Your salary is not determined by your aircraft type. It is the same across the board. Some flying pay may make the actual rates different, depending on type flown. At the moment 777 crew are generally flying more and gettting overtime. Your quoted rates seem to be pretty high - Captains' rates in some cases.
The 14k allowance? Isn't it still 10k? That goes nowhere, whether single or (especially) if married with kids.
The stamp duty of 30% just kills any thought of buying other than a shoebox. Unless you're well off and happy to throw your money away. You really need to look at the future.
Any allowances you may get (pilots allowance, education etc) are fully taxed and only ever cover a proportion of the basic education fees if you get any. There are many extra and hidden costs. Getting school places can be a real deal breaker.
Do your homework and come over with your eyes wide open. Don't say you weren't warned.