Aristos
Lightseeker
Straight out of Civilization IV: Colonization. System was called "Founding Fathers" in that game, and it worked pretty well, given good balance and completely different bonuses for every person and stage (it's not that the 3rd FF has triple the bonuses of the 1st, but completely different bonuses, so depending on your civ and map conditions, it made sense to grab the early FFs also).