I'd go with Rhino for modelling the environment. Fast, easy and, unlike Bryce, you can very quickly arrange objects based on real-world measurements. If you know a room is supposed to be 5 meters by 3 meters by 3 meters high, you make a room in Rhino with those measurements. It's harder and takes longer in Bryce. And Rhino exports 3DS or OBJ, thus perfect for importing into Poser if you have to.