Good stuff, I love some of the unique Balvenies!
My most prized bottle is a Shackleton Discovery Edition signed by Richard Patterson himself, which was a birthday present from my wife many years ago. I don't know if that will ever be opened. Aside from that, I have many that have appreciated to the point that it would take a very special reason to crack it open. Whiskybase has my Dalmore Mackenzie and Blood Oath Pact 1 as the most expensive.