Pointy,
Discovery Bay is a good place for pets and kids. It's convenient to both the city and work (25 mins to each one). A lot of people don't like DB, but then I know the same amount of people who can't stand the city (noise, busy). It's you and your wifes choice, and other peoples opinion doesn't matter at the end of the day. They are not living with you so why should they care where someone else wants to live.
I think you might find Deepwater bay a little expensive but others who live in that area may correct me. You will probably also need a car living that far away from work and that will be an added expense.
My advice is wait until you get to HKG before you make your mind up. You'll be in the hotel for up to 6 months if you want and although initially you'll be busy with conversion training, once you've commenced line training (after 4 weeks or so), you'll have heaps of spare time to go out and look in some real estate agents windows.
Also if you have a dog, go and look at the Gold Coast. They have quite big apartments and plenty of room.
Good luck