it is just getting better and better to live here in Seattle. Legalization of weed, same-sex marriage, and now high-speed internet
The bad thing about WA state is the tax structure -- no corp or personal income tax (good), but the B&O tax is a gross receipts tax, really complex (it varies by county and by type of business), and has pyramiding (as do all gross receipts taxes) -- it's equivalent to a 12-15% corp income tax for many businesses. If you don't use 2-3 levels of contractors, or have a lot of work done as subassemblies, it should be ok…
This is not a tax advice, consult a competent accountant.