I don't drink a lot of hard liquor, but when I do . . .
Gin and tonic - Bombay Sapphire, Pacific Voyager, Dry Fly
Whisky neat - Glenmorangie, Lagavulin, Laphroaig, Macallan, Oban, etc.
Whiskey neat or with diet (including bourbon and rye), depending on how good it is
Spiced rum (with diet or other mixer)
There are some seasonal things we do, eggnog with whiskey and/or rum, bloody marys are a Thanksgiving morning tradition, apple jack with mulled apple cider for halloween, etc.