Katie Morrell at Cascade Kennels. Tell her that Camper's mom sent you.
Katie really understands GSDs. She just gets them. This is where we have done the vast majority of our training.
http://www.cascadekennels.com/training.asp
They do board and trains, but I've never had these recommended them to me. (I used to train mostly with Rachael Sutton there as well, but she moved on to a Guide Dog institute. Sigh.) Lisa there is also good and understands GSDs. I've done classes as well as private lessons at Cascade Kennels. As a matter of fact, I'm taking another class with Katie in March.
Rachael spoke highly of Riverdog in Issaquah as well, whenever Cascade Kennel's classes filled up. We're looking at getting a new dog, and they have openings for a March class whereas everyone else whom I would use is full. So if we get the dog, I'll likely go to Riverdog.
http://www.riverdogk9.com
If you want purely positive training, Dh is doing a CGC class with Ali Johnson who does positive training. She also trains for Seattle Humane. (The training is as much for Dh and Camper to just have time together as anything). But that just started last week, so I have no opinion yet.
http://kinshipdogs.com/
Becky and Dave Bishop (Puppy Manners) are great trainers. I really like them. But they kind of do mostly golden retriever types. Not drivey kids like ours. They can handle them, but their classes aren't set up for them. They also don't do private lessons, as far as I know. But they're an option if you just want reasonable good obedience classes.
http://www.puppymanners.com If you're interested in a class, email Becky first and see if she thinks you would get much out of her class. She'll tell you upfront. She's very direct.
I like Colleen, the owner of the Academy of Canine Behavior in Bothell. She's very knowledgeable. But I would never bring my dog there. They're much too rough handling dogs.
Finally, Packworks in Arlington is supposed to be phenomenal. I have a friend who is very knowledgeable about dogs. (She's the manager of my vet's practice). She brought her dog, who had some overt behavior issues there, and was thrilled with the results. She's seen similar results with other dogs. I met Michael of Packworks at a dog fair and was impressed with him. Gretchen is a bit odd, I admit. But they apparently do very good work. If I were to start all over again, I would not hesitate to try them. And if I had specific problems I wanted to work on, I definitely would use them.
http://www.packworks.org/
If you want to stay on your side of the lake, I can probably get you another name or two. There's a service dog trainer in my service dog association, and she's recommended a few trainers in Seattle itself to someone else who asked. I didn't pay attention at the time. But I can find out if you'd like.