Just wanted to add a candidate to the list. I don't get to travel about too much these days so it's rare I get out of my local area to sample other stuff, but I had the chance this last week and really think the Keystone Prow on the east shore of Loch Eribol at around 6C must be up there among the best problems I've done anywhere. A blatantly obvious line through an impressive feature with the crux at the end, out on its own on the shore of a beautiful north coast sea loch. Pretty much the definition of quality for me.
Edit: just spotted that it's already on the list! Oops. But happy to confirm it definitely deserves to be there.