I'd get Seasons. You have several worlds already, and this pack revitalize them all :) I love seasons in say Windenburg and Brindleton Bay, to mention some. The entire game gets so detailed and more varied with the changing weather and seasons. You will need a minimum of planning (who wants to throw a garden wedding during a thunder storm?). I think weather and seasons also makes personality and family building more interesting. As the year changes, you will focus differently on activities than before. Like plants growing when in season only. Having a garden gets like a new experience. There is also a nifty calendar to keep track on events, holidays and the weather forecast.