You really need to decide what you want in a dog and go out and see some dogs training. Again, the primary influence on the dog's temperament are going to be its parents, not whether it is Czech or DDR. Also, what specifically are your goals for the dog? Even then, pups are a crapshoot. You sound like you are concerned you might end up with too much dog for you to handle. That isn't likely unless you have some good connections to people with strong dogs and since you are green that isn't going to happen. You should be able to manage most any pup unless you don't do any self education on how to raise a pup with some drive and character.