I know I've come a little late to this thread but I have been drinking absinthe for 5 years now and I only buy from one place
Alandia World of Absinthe
Personal recommendations:
If your looking for the full affect Strong68 has the full licorice flavor at the classic alcohol percentage
If your looking for something a little milder to start I recommend the Franco Suisse. It has a slightly lower alcohol content and a different recipe. Unlike some sites most everything you find here is gonna have different flavors because all recipes are different