Well, then we should have the funds to go for all of these at once:
[] Olive Farm [120 Talents, takes 1 year to build, will produce five units of Olive Oil after five years] Olive Oil is a valuable trade resource that the city can ship abroad for export.
[] Fishing Jetty [140 Talents, takes 1 year to build, will produce three units of Salted Anchovies immediately] Salted Anchoves are another trade resource, and a fishing jetty can encourage fishing among citizens, improving the city's naval and merchant tradition.
[] Stone Theater [130 Talents, takes 2 years to build, will raise the city's reputation and profile and net 30 talents a turn from citizens].
Probably more, once we get the loot from Syracuse. And there's not much reason not to get started on all of them immediately. Though obviously we want to keep a reserve for any midturn expenses that will probably pop up--but the Sacred Treasury, at least, gives us the safety net for war expenses and real emergencies like famine.