Thanks guys for all your feedback.
I checked out the Boeing site soon after I posted.
For some reason, I always thought that Everett was south of Seattle......must take more notice when on my flightsim next time.
As far as hotel prices go, I'd look at mid-range. Not the Sheraton, but then not a dive either; after all, it's just somewhere to sleep.
That Grayline Tour seems just the deal because it would cover other attractions too.
Another attraction I didn't even think about was the Seattle Museum of Flight.
Must check that one out too.