Re: KNPV Lines
The vast majority of KNPV dogs are unregistered Mals and DS's. There are differences in the various lines of those dogs.
When you mention a dog from KNPV lines with GSD influence, I'm assuming you mean a cross between a GSD and a Mal/DS. The problem you will run into there is that if you go with a pup (good luck finding a GSD X Mal/DS breeding) you are not really getting a pup from an established bloodline. If that is how you want to go, you will be much more likely to find a GSD X Mal adult. Then you get into the issue of if the dog is so good, why is he for sale?
I would forget about the physical appearance aspect and focus on learning about actual proven bloodlines of unregistered Mals/DS's and your odds of getting a healthy dog with intense drives and good nerves will improve.