I just bred my gsp to my pit. both dogs are small maybe weighing 40-45 pounds but both are extremely athletic. I guess it depends on what kind of dogs you want to make. I like dogs 40-50 pound range. Its just preference I guess. I know I would take two 40 pound dogs over one 80 pound dog any day of the week.
Im wanting more of a 70-80 lb but athletic dog, but that may just be from a lack of experience. I usually hunt alone and since we can only hunt three dogs each out here Id like three 70-80 lb short to medium range dogs that can run well in these mountains and find and catch on their own.