you should check out the RBCiv Conquest discussing thread in the CFC SG forum. a lot of comments for specific conquests are made there that may help you. they also played all the conquests up to Napoleonic Europe. i was in Age of Discovery (cultural goal, French) and Napoleonic (domination goal, Russia) and found both of them quite enjoyable
http://forums.civfanatics.com/showthread.php?t=68410 <- the link