Next week new version of SUAS will be released. New features such as X3D and KML supporting in Google Earth will not let you down. You can easily build your 3D city map in Google Earth or in Vrml/X3D 3D viewer.
Here is one snapshot, I am looking for some city data for the demonstration. If you have some data in shapefile or mif format, and the data is free, please contact me, thx!
Of course, SUAS will have some other new features.