Qatar is not a bad place to live. Your salary seems to be fairly reasonable and will suffice and you should be able to live well and save.
However - Beware! They can turn off your contract at the slightest whim and leave you without pay and debts to pay. You will also need an exit visa and if your sponsor chooses not to give you one then it can get very precarious! You will be the sponsor for your wife and family so they will not have a problem leaving.
Just do some research first, look at the problems some of the expats are having or have had. I was one who suffered and had to wait 3 months for an exit visa and they owe me $30000+ with no chance of getting this money. Some consider extreme ways to "escape" the country without a visa.
Nice big salaries, promises of luxury living (not maybe what you consider luxury). More or less everything in Qatar is a facade. If you decide to move there, my advice is to save as much as you can and send it home regularly.
All I'll say to finish is: Money isn't everything!