Latest gave I've tried is Citadels. WOW - I have been blown away by it.
It has a typical Euro box (not appealing), but it hides a very interesting game underneath. The general premise is building 8 districts in your city before anyone else does. From this you score points from your city, districts built and what not.
Each round you’ve given the choice of which character in the city you wish to play, and each has its own abilities.
I won’t go too much into detail (yet), but it really has become my group’s favourite party game.