I've noticed that my liquor cabinet has been growing, because I add bottles from time to time but I don't drink from them that much. Maybe it's the emotional support of having all these lovely bottles in my appartment that I really need
For gin, I'll second Bombay Saphire. It's pretty good plus I just like the blue bottle
Charlatan mentioned Ouzo / Pastis.. Definitely good if you like licorice! In fact Pastis is the most licoricy or them. The Lebanese alcohol, Arak, is pretty similar to Ouzo, so I always have arak in my cabinet
A triple sec liqueur is always nice to have around for sipping, especially after a heavy dinner. My favorite is Cointreu, it tastes of bitter oranges, mmm. Grand Marnier is really good too.
Another good liqueur is Drambuie.
Finally, black sambuca is always good for shots