I just got back from Scotland and was looking for the same thing. Stuff I can't get in the states. You were asking for "the best" but I can at least tell you few more that aren't available here:
All the Diageo "Flora & Fauna" series. They have pictures of animals on the labels and are often single malt bottlings of whiskies that are components of the company's blends. Mortlach, Daluaine, etc.
There is also a Duty-free Glenfiddich 19 year old "Age of Discovery" aged in madiera casks. Haven't tried it.