Sounds Great! You'll love riding through the west. Just a couple suggestion of my favorite sights. Make sure you hit the badlands and black hills/Rushmore in SD and Devils Tower. The 101 down the coast in Washington is breathtaking and Vancouver is a blast! One of my favorite cities for sure. If you have a bedroll (And it's not raining) pull over sleep on the beach under the stars. The Pacific up there is nothing like the Atlantic and I can guarantee you you'll never slept like that again.
If your going the budget route and need a place to crash we have a spare bedroom in STL on the way back.
Two wheelin for the feelin.