Tom, you can't put a price on "must haves"!! Looks like the collector plate restoration and WA's cost to register with it, is about 42% of the total. The big item ($303) you would have had anyway with the standard forever antique car plate.
I had one of those WA plates on my '39 when I lived there. The forever plate is a sweet deal. Here in AZ, we have to renew each year. Seems to vary based on the age of the car, but in general, it's about a hundred bucks.
The states get their money one way or the other!!