In no particular order:
WARLORDS! - China in Disarray. Take Diplomacy, triple the cut-throatedness and make it simple enough (in theory) to explain the rules to a new-comer in five minutes (and about 1/20 the price).
World in Flames (the virtually unarguably best strategic simulation of the entirety of WWII).
Bloodbowl.
Lunch Money.
Close Action (an awesome Napoleonic era tactical naval warfare game, ideal for heaps of players).
Down With the King. If you see this game, buy it. Seriously. An epic, cutthroat, non-collectible card game of sex, scandal, blackmail, murder and politcal intrigue straight from Machiavelli's handbook.
I voted for Car Wars BTW.