We usually have:
Bulleit or Woodford Reserve level bourbon (I play around with different brands)
Templeton or another equivalent Rye
Tito's vodka
Cruzan Aged Rum
Myers Dark Rum
Cuervo Silver tequila
Cointreau
Sapphire gin (but I've had the same bottle for 3 years, don't use much)
Pernod
Dry and Sweet Vermouth
A variety of bitters
The above gives me a lot of flexibility to play around with new drinks, but the most common drinks in my house are Old Fashioned, Manhattan, Cosmo, Margarita, Sazerac, vodka Martini, Mojito and then just various mixes like whiskey & 7, rum & coke, etc.