Narny, there are lots of good German showline dogs out there but they will need lots of exercise and training and outlets. Look at Liesje's Nikon (member on the board). Nikon is a German showline, a very handsome dog, but also clearly needs a job and does very well at all the activities Lies does with him. There are lots of working line dogs out there that have no jobs other than family pet but they get LOTS of mental and physical exercise. Yes, lots of American show or pet lines are softer and more sedate, more like golden retrievers but many do need jobs and excel at agility or obedience or herding. Bottom line, yes you may want from one GSD type or another but working or show or pet, you are getting a German shepherd dog and you do need to be prepared for a dog that won't accept a half hour walk a day and a few minutes of training a few days each week. Just make sure you're prepared for a dog that won't ever let you forget you own one.
Make a list of traits you like in a dog and a list of traits you dislike. BE HONEST about your schedule and your willingness to commit time, money, and gas to training your dog. Are you resolute that you do not want to participate in any dog sports or did you see an agility video on youtube the other day and you thought it looked like something fun to do? Do you want a dog that will be a pal to everyone or do you prefer a dog who doesn't give a rip about anyone but you and your family? Do you want to be continuously challenged to be a better dog trainer or will you train because you have to, not because you want to and enjoy it? Do you want a dog you can take anywhere that will allow dogs or do you prefer "just a dog" that hangs out at home and in the yard? Questions like these and your list of good/bad traits can be taken to breeders of the different lines and they can tell you if their lines will be a good match, recommend you to other breeders within the type if not, recommend you to the other breed types, or tell you that you may not be a good candidate for the breed.
If you want to get a better idea for what you're looking at, gather some of the breeder websites you're looking at and post them and we can tell you what lines they are. Ralhaus has working and show litters.
V Nord II Suché Lazce - German Shepherd Dog
This is the male at the top of the page from the Ralhaus link you posted. Notice how the dogs in the pedigree look almost identical? That's a quirk of German showlines. Yes, you will see working titles, but if you watch the working portion of a sieger show and compare it to the Schutzhund nationals (which you can, thanks to YouTube), you will generally see a huge difference in how the dogs are worked and how the dogs react. There is a lot more to it than just that statement and it has been thoroughly discussed in other threads on this board.
V1, CAC, CACIB, P1 Samer z Kurimskeho haje - German Shepherd Dog
The male from the bottom of the Ralhaus page you linked. See how they all look different? There are sables, a black, and a black and tan. All sorts of working titles.
SEL CH Kaleefs Geneva Aeval-Achtung - German Shepherd Dog
A very famous American showline dog. Just like with the German showlines, there is a lot of uniformity in type (but the German dogs just look Xeroxed to me). ROMs and Ch. designations dominate, you will see AKC titles like CD, CDX, RN, etc.