Settler is down from 5400 production price to 852 production on nightmare eternity. This is about a third of what it cost before the current run of production tweaks. A spearman costs 725 production and a town watchman 1146. A size 25 city city is around 250 production per turn. All in all costs have gone down a great deal, which I suppose is fine. I'll have to start a new game in order to see what influence it has on a game through the ages.