OP, how about getting an older dog? It seems from your post that no one is quite sure what kind of dog you want and what type would fit best into your lives and by getting an older dog you’re only making a commitment for a few years as well as giving a dog that is possibly harder to home a home.
As I’m sure you know children often like the idea of a dog but not the reality and the care is left to the parents. And with everyone having busy lives, providing proper care for a dog can often come last in a long to-do list.
I just got an oldie. An 11 year old Parson’s Russell Terrier. She’s only been with me for two and a half weeks but has settled in amazing well. Loads of energy, super clever, very affectionate, full of character. She does need quite a bit of exercise though so maybe not right for a busy family but an oldie of some sort might be the way to go.
Have a look here:
http://www.oldies.org.uk/category/adopt-an-oldie