i always keep the basics on hand:
vodka
gin
rum
whiskey
jack
white wine
red wine
tonic
soda water
coke
sprite
orange
cranberry
some domestic beer
some imported beer
then depending on when you come over i usually have:
baileys
kaluah
some schnapps (peach and raspberry)
i like knowing that I can invite friends over at anytime
you can always stock your bar with the bare minimum - keep wine and beer on hand.