This party will rock my world.

Carl Jung
For conversation, of course.

Ramses II
I want to hear war stories and porn! Nobody beats Ramses the Great on those accounts. Guaranteed win.

Neil Gaiman
First off, because I am a shameless fan, but mostly because I think the three of them would get along grandly, and I would be privy to some INSANE conversations.

Perhaps even the start of an amazing adventure, with time travel, and Hittite armies and great gory battles and dream visions and dark sarcasm!

W00t!