of the Wa section PCT Is outstanding. It goes from Stevens Pass to Snoqaumie. I think is one the most beautiful parts of the WA PCT. It is about 74 miles or so and could easily be done in 5 days at the 15-20 mile pace mention.
If I was to do it all over again I would plan on spending about 3 whole days at Spectacle lake, still to this day that lake sticks out so vividly in my mind. I think you can loop into it as well, if your not wanting to do a whole section.
Keep us posted, with your thoughts.