Hi Stephanie,
I agree, renting would be best. I don't specialize in rental property BUT I do know that the best place to locate a rental is on Craig's List. Most Landlords (including properties managed by agents) use that site heavily and most of my Navy relo's have had great luck with it. Most of the landlords up here like renting to military families too. When you go to Craig's List, click on WA, then Seattle. Go into Housing/Apts. and then at the top type in the city you're interested in. That's going to be your best bet.
Well up in Marysville, you won't really have to worry about traffic too much. Sometimes on weekends the Seattle Premium Outlet Mall is packed but that's about the extent of it. They also have a new shopping mall (near the commissary & exchange) with Petsmart, Kohls, some fast food, etc.
You'll like the summers up here, they're really nice. Winter's are cooler but they are still very mild, just not as great as SD :-). Here are a few links about the area:
Snohomish County Tourism Bureau - great for getting a flavor for each city.
Marysville Chamber of Commerce - To order a relocation package
Seattle Premium Outlets - A huge outlet mall is located in Marysville on the Tulalip Indian Reservation.
Tulalip Casino - The county's largest resort casino.
The Outback Petting Zoo - Arlington is a few miles north but they have a neat petting zoo for the younger kids.
Smokey Point Commissary - The commissary is located in Smokey Point Support Complex. It includes a gas station, NEX, NFCU, Navy Lodge, Housing, Thrift Store, etc. It is located off-base but ID is required to shop.
I have a friend that lives in Lake Stevens that belongs to a Mom's group and it's been a great support group for her. If that's something you think you may be interested in, I can get their information and pass it along.