Is a Collie a good dog for me?

Boston the Border Collie is 3 years old. He is fit and very active. He needs at least 1 long walk every day, about 5 miles. He has 3 other walks during the day and his last walk is at 8.00pm. He is a chewer and consequently we have an indoor kennel for when we are out or asleep. He is very good with young children and loves to meet people. He is aggressive with a neighbour's dog who he antagonises at every opportunity. He cost �140.00 from a local breeder. We have a medium sized fully enclosed garden and he has the freedom of that when he chooses. He has a dodgy tummy and eats 'sensitive' dog food. He is lactose intolerant, which all dogs are to some degree. He is not allowed processed meat at all. We got him at 6 weeks and he is a superb family dog. Most breeders do not advise Collie's as pets as they are bred to work. If you are prepared to exercise your dog appropriately there should be no problem. They are the most clever of all dogs and very loyal. He has a pal, Ruby the Yorkie who lives with him, she's 1 year old.