How about an Auction system for initial release day of new Districts or Wards. Initial prices are initially low to start, but people can bid on houses for up to 24-48 hours after initial release. The bid placed is deducted as if you bought it preventing people from placing bids they can't afford or bidding multiple high amounts all over and locking people out. Winning on a plot removes your bids from all other houses and prevents new bids from being made for the duration of the Auction. Losing bids get their money back by mog mail. This way it's not first come first serve, avoids server issues as everyone won't necessarily log in at server start and gives people who for one reason can't log on at server start a shot at getting a plot.