nationality
I don't want to sound rude with this post, but what I am about to say is the reality in the UAE. You say you are Canadian, yet your language skills do not seem to be native Canadian. Can I ask what country you are really from? You see in the UAE, most companies will pay for your nationality, or worse.. your skin colour. I am a white native Canadian and was offered many jobs in Dubai as a flight dispatcher. Now the problem is, they can afford 3 people from a poor country for the same salary they have to give me. So really, unless you are willing to work for peanuts, chances of them giving you what you are really worth are slim. I was a flight dispatcher and Dubai and was paid reasonably well considering mine was just a second salary. I would not be able to afford a normal Canadian lifestyle (have my own appartment and not share with 20 other people) on the salaryI was earning.
Good luck, but I think you should stay in Canada. As for income taxes, you must sell everything, not leave a wife behind and not go back to Canada too often and you won't pay tax. You will be a non-resident. But if you keep furniture in storage, or even a car or own a house, you will have to pay tax.