Good luck with your search.  You got lucky on that first dog. You can't breed a dog and expect you'll get all those things. It can happen but I would be lying to you if I said I expect my puppies to have all those character traits. Some of those traits IMHO are contradictory, although they can be achieved to a certain degree through environmental conditioning and training. I suspect that your first dog became those things that you are looking for because of environmental conditioning and training. Much like how an eagle teaches her babies to fly or how a young pup learns to herd or guard by being around the older working dogs and observing them work. I've done the same thing but  bringing a dog that has never been agitated nearby to see another dog that is skilled in personal protection. Soon the young dog will pick up the behavior and it's body language appears to be eager to run off the decoy. It is learning its job.