So the answer to this question is another question. What kind of party and who are you inviting? Whats your price range per bottle? Is it for wine ponces or bogans or something in between? If its for ponces... good luck. Bogans, who cares, get some popular grocery store stuff on sale. They wont know nor care.
Good drinking good value (****) affordable wines are available in all these groups. These wines are not the norm in the USA and will be encourage great conversation and expand most regular wine drinkers range.
Cheers and enjoy your soiree.
Happy Wine Adventures,