If you like the 15yr old, you'll really like Glenlivet 18. It's a bit pricey so I usually stick with the 12yr as it is available almost everywhere. If you are feeling adventurous you might try Aberlour A'Bunadh Cask Strength. It's about 60% abv so a small splash of water or a single ice cube is recommended to open up the flavor. I usually bring home a couple of bottles of other scotches from Gulmohar's that are not available here in the US.