In Seattle area also. Did you end up finding a place?I think platinum satin is beautiful. Just not ideal for my VG Macan with black trim and the bronze/orange brake paint I chose. Also I think black is fine for 20-21" wheels. Just need to see a fuller picture of the black painted stock 19" wheels to see them in the context of the car. That way I know if it's a good choice.
My first powder coat quote was $800. About twice what I was expecting.