What is the game you turn to when nasty household pests have you down? When you just want to get some of the aggression out? Earth Defense Force has been the go-to series for those of us who want a game to simply chill out and blast away alien bugs. The best part? They have all contained some of this generation’s most enthralling cooperative moments. All of this at very affordable prices. We are talking the cream of the budget-title crop here.