Yeah, sounds like a utility recommendation-request, rather than an application querie...and for that, Microcosm would seem to be the logical choice (seeing as it has so many expansion options available). However, if you WERE willing to venture a new interface, then consider Bryce 5.5 (at half-off the regular price). DAZ has been steadily increasing the interoperability of Poser/DAZstudio and Bryce...great terrains, water, skies, etc. AND a fabulous little rendering engine (if somewhat slow).