IMHO, any puppy is a gamble, especially for a PPD. Dogs that are excellent in personal protection, and are also capable of living in the family environment are hard to come by. Even with the best of parents, not all puppies in a litter are likely to fit the bill.
If you are in need of a PPD, I would suggest getting a finished dog from a reputable trainer, along with handler training for you, as well as having a plan for sustainment training in the future. IMHO, forming a bond with the dog won't be an issue if it's a good dog and your personalities match. Be prepared to open your checkbook, as finished PPDs are expensive.
OTOH, if you want a puppy, and just want to do bitework as a hobby, your options are much greater. Just about any dog with good nerves and some prey drive can have fun doing bitework. Just don't count on that dog fighting a man for real.
When a dog saves the life of a man, it becomes clear that partnership knows no bounds.
Fama - T.E.D.D. OEF XI-XII (GSD)(RIP)
Marshall - T.E.D.D. OEF XII-XIII (Lab)(SF EDD)
Lucian - Med Alert / Mobility SD (Cane Corso)
Pud - the old man (Pit x Lab)
Hank - DW Dog (Cane Corso)