Hi Pozero - you might give Carrara 3D Express from http://daz3d.com a try.

If you need something that can tune up your polygons you might look into Silo (http://www.nevercenter.com/) - this one is not a renderer, but it has a lot of polygon modeling functions. So it could work for you as a tool to fix up your polygon data and then re-import it back into Poser for rendering.

- Michael