America: George Wallace (look him up if you don't know him). Different "George W." then the one you're thinking of, and quite frankly I like the current President... so don't assume everyone agrees with your Dubya bashing
IT bothers me greatly, so please stop.
America (Continued): Harrison (either one), Polk, Andrew Jackson, Andrew Johnson, Nixon (although he did do some good things), and Carter. America should (IMHO) should pretty much be Washington or Lincoln only.
I won't complain about FDR though.
England: Cromwell to a degree, or perhaps William II. Chamberlain.
France: Napoleon III or DeGaulle.
Russia: Stalin (Civ I appearance's aside), or Ivan.
China: Personally I am against Mao, because of the number of people he killed (at least 40-60 million... possibly a lot more). Nor would I be in favor of the leader of the Nationalist Chinse... can't remember how you spell his name off hand (headache)... as he also killed a lot of people.
Japan: Tojo
Spain: Pizaro (He was Spanish right?) or any of the other so called "explorers" in the Americas.
Greece: Plato, while he was a great philosopher and wrote "The Republic", I still think he would make a bad leader for Civilization.
Egypt: Ptolmy.
Babylon: Captain Sheridan (five points for whoever gets this joke)
Rome: Nero, as has already been suggested. Plenty of other tyrants in there. Brutus, Cassius.... oh boy.
Technologica: Bill Gates
Wisconsin: McCarthy