Well...
First, thanks for the response. Greatly appreciated.
Second, I have my eye on some of those ancient Rome haks. I've been wanting to do a Romanesque city for years. My current capital city is supposed to have a roman feel to it, although I removed all the outdoor temples. I just couldn't get a proper roof. The ancient Rome hak has exactly what I'm after.
After that, I'm not sure, but I would kill for more bridges/spans that have an underside so I can place them in the air, even if not usable. And some more domes/towers.
For my cities, I tend to google images for fantasy castles/cities for inspiration, and damn if the toolset isn't lacking, even with the CEP, when it comes to architecture.
I will bite the bullet and test out the Rome hak and see if anything crashes.