Upgrade or alternative upgrade?

Just replace experience in chests with money; also, you can sell artifacts at the market. Then, you can postpone building the Capitol; it's quite cheap, by the way. By the end of the second week, we have bears (I prefer the upgraded ones), upgraded warriors, and spearmen (you can also use the non-upgraded ones), and we start building bone collectors, whom we leave in the castle for the time being. We mostly deal with neutral creatures using magic.