For the sake of simplicity, I would suggest having the same license for every wiki on the network. I don't think we really need a non-commercial clause, because I don't think the wiki's content is likely to be used for commercial purposes--how would anyone make money off of it, beyond hosting a mirror with ads? Besides, if anyone was making big bucks off of it, I'm sure they'd receive a cease and desist letter from Paradox sooner or later. Additionally, CC-BY-SA is the same license used by Wikipedia, so we'd easily meet Wikipedia's "share alike" requirement, should we want to copy from it.