A full version of Siemens Solid edge; info here:
http://www.deelip.com/?p=6517&cpage=1#comment-8662
Of course like of other cutting edge software its not tailored for the Landscape profession but unlike Revit (for example) it is a generic 3D modeler. A major drawback is its inability to import entities as wireframe in 3D but this can be worked around. History based (Parametric) and direct modelling together:
http://www.youtube.com/watch?v=k8sGXEoJHQ8&list=UUEmep5pW2Nsu0h3YPjp_Edw&index=6&feature=plcp
with the impressive Nurbs surfacing capabilities from its unique Bluesurf and Bluedot technology:
http://www.youtube.com/watch?v=JOryQdsq71Y&feature=related