Many good suggestions made already. I would add:
Wild Turkey Kentucky Spirit
IW Harper 15 years
Hancock's Reserve
Unicorns are many, some greater than others. Some that I appreciate:
Wild Turkey 12 years (Cheesy foil)
Elijah Craig 23 years
Parker's Heritage Golden Anniversary
etc.
Regarding Pappy, I consider the 15 year to be their best offering, complex and vibrant. If it is worth the asking price these days it is debatable, it depends in what tax bracket you are and how much one desires to acquire a bottle.
I would also suggest that you look into Single Grain whisky from Scotland bottled by independents. Cambus, North British or Invergordon distilleries. Lighter on the palate and not as intense as bourbon but with similar flavor profiles.
From Japan, Nikka Coffey Grain. If no financial restrictions, one of the unicorns, Komagatake 30 year old American Oak.
For what is worth, I worked for over 20 years with wine and distilled spirits, and managed the 2 bars with the largest selection of distilled spirits in NYC.
Hope that this is somewhat helpful.