Recently I came across Corinthus in the City Construction Kit. It's a small map, which is something I personally happen to like, with some quite interesting invasions.
I decided not to import timber and manufacture furniture, so that limited my housing to Small Insulae. There are six housing blocks achieving a population of just over 9k. Unemployment is very high (37%) even after using fountains to soak up some of it. One rule I made for myself was to not have any fountains outside the city walls where they might affect invasions.
I have also started a discussion thread in the Caesar 3 forums on Corinthus.