I've just tried the Caol Ila 12, but I'm already a fan. It's got lots of flavor but also some good nuances and a satisfying texture. It's about $45 at my liquor store which puts it at about the same price point as the Lap 10. While I like the Lap 10 a lot, I think the CI 12 has the edge in the flavor department.
Now, if the Lap QC were on this list, I'd might go with that: I like the peaty-sweet balance and it's also around $45 at my local store, which I think is a great bang for buck ratio.
I guess I should qualify my Lap QC comments: I suppose if we're going by the strict title of the thread, the Lap QC is out because it's probably younger than 10. Still, though, I think it fits the spirit of the category.