RE: GSP
If all you are looking for is a pet then I wouldn't get a GSP. They have HUGE amounts of energy and unless you have time to spend with them, that energy tends to turn towards negative behavior - chewing things up come to mind.
If you are looking for a hunting companion it's a great breed for that, but I would consider another breeder as the one you listed looks like they are bred for show dogs. Of course they will have natural instinct because of the breed, but I'd look at a breeder that has been breeding their GSP's because of their hunting skills.
My GSP is HIGH energy. That boy is go, go, go. I'd really take that into consideration if I were mostly looking for a pet rather than full time hunting companion.