Belgian Malinois
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Belgian Malinois
Bear knows his stuff.First of all, stop affording so much importance to breed. You can find any personality in any breed of dog. Described breed characteristics are a vague generality at best. Every dog is different. With that said, focusing on a breed that generally has the characteristics you want is a good starting point because individual dogs within the breed are more likely to exhibit them.
If you want a pure bred, it sounds like you are looking for a good Golden Retriever. There are two basic personalities in Goldens. The first is a very mellow dog that loves nothing more than walking around with a toy in their mouth, there eyes at half cast and a low tail wag. They are almost always looking for affection and are great dogs. This is the type of golden that gives them their reputation. It's also only about 20% of them. The other 80% are live wires that have WAY to much adrenaline pumping through them and they can be a complete pain in the ass without serious training. With training they can be absolutely fantastic dogs, but you need to know what you're doing.
If you are getting a pure bred puppy you need to select that puppy carefully. Go to a breeder that has both the mother and father on sight and interact with the parents to see if you like them. If you do, interact with the entire litter and pick the most average puppy. Don't get a stand out, which is what most people do. The most average puppy is the one that is most likely to reproduce the things you liked about the parents.
If you get a mutt, make sure they are at least 6 months old and interact with them to make sure they have the personality you are looking for. Realize that when you are first interacting with a dog, many times they are on their best behavior and if you see any behavior that is questionable, multiply it by five to get an estimate of what the dog will be like when the honeymoon is over. In a perfect world, if you want a pure bred, you will interact with a pure bred that is at least 6 months old so you can evaluate the personality of that particular dog, rather than the parents and hoping for the best.
Labs are also great dogs, but they do not have the long hair you said you want.
There is good reason that Labs and Goldens are two of the most popular family breeds in the US.
Remember, DON'T make your decision on breed alone. I have worked with Labs that had no instinct to retrieve at all and the worst scares on my body are from a Golden Retriever. Obviously, that is not typical of either breed, but it can happen. Any individual dog from any breed can be very bad news.
Border collie is the answer to all of your requirements.