Lagavulin 16 and you won't drink anything else ever again in your life.
If you like Lagavulin, try Caol Ila. The 25 year is TASTY however I really like the Moch and it’s not nearly as pricy. I was never really a fan of islays until I tried it. Much smoother than say a laphroaig. That and Old Pulteney 17 are my current go-to single malts. I always go with a dram of Islay and a cigar, or a nice highlands single malt if I’m just sipping.