Dalmore 18!! Water is sacrilege but a cube or two it's as close to perfect as it gets! Of course a 21 or even the impossible 30 plus is closer but not on a pilots salary!
Any of the Macallans is perfection, but anything past 15 gets pricey. The 18 is amazing but haven't had the funds to try anything older. A splash of water to open the flavor is needed OR an ice cube, not both.