I just finished off my bottle of Balvenie 14yr Caribbean Cask last night.
I've never had Highland Park 14 yr. The 12yr is good, but the 18yr is where it is at! HP18 is some of the best stuff out there.
Try the Balvenie 17yr Doublewood. It is head and shoulders better than the 12yr Doublewood, which is itself very good.
For something smooth, a little spicy, a little sweet, and all-together wonderful, try the Glenfarclas 15/17/21/25 year. They are similar, with the 15yr being the best, followed by the 25, 21, and finally the 17yr. However, they are all excellent.