Shaolin your approach to things is excellent and your involvement providing service outstanding ( We are also both Paramedics and Fire Fighters, our jobs revolve around doing things so that others live...
. ) WOW This takes dedication.
You did say " the opportunity to find the perfect girl " so if I can comment on this -- be aware that this takes more than the PHENOTYPE of the dog , the "girl" and your male . Unless there are the qualities that you are looking for available by the genes - the GENOTYPE , which requires deep research into the pedigree , looking at in not in a linear fashion but into a dimensional way, only then will you have the best chance of getting what you want.
Could I ask why you don't trust your breeder to use your dog (male) responsibly and with best intentions. You did trust them enough to have provided you with this male?
they did come highly recommended by two breeders and "Per the breeder and what the other breeders who recommended her stated, some of her dogs have gone on to do great SAR work, Police work (Possibly in California. I don't remember the specifics), and various other Work/Obedience applications".
They won't be your pups . They always belong to and are the responsibility of the person who has the female - they are "the breeder" not the owner of the stud. The owner of the stud has control deciding whether his male is bred or not . The care and raising and finding homes and guarantees are all on the shoulders of the owner of the female.
If your breeder is this good I would keep visiting or at least speaking with them. Learn which combinations with your dogs genetics worked best. Since they are breeders they are always looking into the future hoping to find those exciting new dogs with breeding potential that would mesh well. Act in co-operation , have them point some dogs out and have them discuss the plus and minus of each combination.
and you said "They will work until their last breath " SOME - FEW -- if only it were so , there are others who have no desire whatsoever -- no drive and no nerve -- some are just not equipped for it .