I'm enjoying your PTR as I am also going in October (just earlier in the month).
Sunshine Seasons is one of my favorite QS options. The food is REALLY quite good... and frankly, better than some of the TS options that I have eaten. I really don't like burgers and junk all the time, and we have always been happy with our meals there.
Columbia Harbor House is my favorite QS option at MK. My daughter is a Tuna sandwich fiend, and loves it there ... and frankly, she appreciates not having to eat chicken nuggets at every meal. I have had both the lobster roll and fried shrimp and was satisfied.
Backlot Express had a vegetarian sandwich years ago that I adored... and the replacement is not as good. I haven't gotten over this. (Side note: I tend to hold food grudges with places when they get rid of my favorites.) But, that being said, we enjoyed our meal there last time. I often read on Disney food boards where people tend to not like the food options at HS, but I quite enjoy them.
I lived in Norway, so Kringla is always a snack stop for us.