Go to Oak Harbor and talk to Brian or Greg at Island Pet.
You can also go to Shoreline to "A Red Sea Aquarium" or go to Lake Stevens where there is Reef Mystique and Bridges Pets.
I have not been to Bridges Pets so I can not speak of what they carry. Island Pet has just about everything you need as far as filters, overflows, pumps, and advice. They even have live rock for $6 a pound. Only bad thing is there's no Coraline on their rock. The LR at A red sea Aquarium and at Reef Mystique are some of the best looking rock I've seen in 20+ years of working in pet stores and having a fish tank.
A Red Sea Aquarium in Shoreline has lots of pumps, protein skimmers, sumps and can custom build anything you would like.
If those 4 stores can't get you what you want or need, you're setting up a very intensive set up.