Before we got our pup, my husband was of the mindset that he was never ever having another dog. He had dogs previously, and didn't want to be tied down that way again. One day he caught me looking at a rescue dog online, which sparked the conversation of us potentially getting a dog. When he realized that I really wanted a dog, he reluctantly started discussing breed options (his previous dog history being lab mixes and a malamute). We began researching and decided on a V.
Even though my husband ended up agreeing with getting the dog, he told me that the responsibility of the dog was left entirely to me - toilet training, obedience, walking, etc. Though my husband loves our dog, these tasks still fall to me. Over the past year and half I have gotten used to getting up at 5 am with the dog to play and exercise. I come home at lunch to again, play and exercise the dog. After work, it is the same thing. I have taken the dog to obedience classes, and now agility classes. I do not have kids, and honestly *for me* I don't think it would have been possible to do what I have with our pup, and still look after the two kids - unless my husband were to take sole responsibility of the kids, while I look after the dog :P In addition to training the dog, you will also need to train the kids in how to deal with the pup (which may be harder than training the dog :P). However, if you want something bad enough, and commit to it, you can accomplish anything!
Your a mother of two, so your likely more patient and used to lack of sleep than me.
My friends and family (most who have or have had kids) tell me that my dog is needier and higher maintenance than a kid. I don't know how much exposure you have to the breed, but RBD's suggestion of finding some Vs to hang out with and/or borrow is an excellent suggestion to see if a V would be a good fit for your family.
As for destruction of the home - lol We will be putting down new floors next year, and I'm going to be researching to get the most durable , aesthetically pleasing floor I can find. I don't know what you've selected for a finish, but a V is not an easy dog on a house. Mind you, they may not be any worse on the floor than rough and tumble kids
You know your family best, and what your capable of - Goodluck!