If you live in Washington, you'll have to pay the tax on anything you try and license here, no matter where you bought it. If you are an out of state resident, then you don't have to pay the sales tax.
I am in the Seattle area and will be having the car built locally by a mechanic who has done a lot of Caterham work. I don't have the time or talent (especially the talent) to do the build myself, though I expect to help some.
I will be ordering the 260 hp Cosworth with a 6 speed. April can't get here soon enough.
After years of wanting, and thanks to a great wife, I ordered a new CSR this weekend. Should be ready to drive in the springtime. Can't wait.
So it looks like I will visiting this forum pretty regularly.