Is it worth the money? What do they add?
Conquest of Paradise - Randomly Generated New World, more options as native americans, can play as your colony
Wealth of nations - declare wars over trade, pirates, trade companies, and hindu gods.
Res Publica - Expansion of Republics
Art of war - Religious league wars, revolutions, Marches
El Dorado - Custom Nations, revamped exploration, Pope can give you brazil finally
Common sense - Government ranks, subject interactions, religious mechanics
Cossacks - Estates, Horde Unity, Advanced Cultural Genocide, Improved Espionage
Mare Nostrum - Boats, Timeline replay, form the Roman Empire. Sailors!