Attached Link: Wings 3D

Even though you can assemble some things in Poser using primitive shapes, it's technically not a modeling program, and takes a little more effort to get something to look right than it would to do it in a modeling program.

In the image here, I made a model of my PC using nothing but Poser and primitive shapes. It was before I knew how to model, and hell, was kinda fun.

Now, I use Wings 3D (see attached link). It's a free modeling program that's extrememly easy to learn. You can always try Blender if you're feeling frisky as well :o)

... and...

Welcome to renderosity :o)

                                                                                                                    

Poser 10

Octane Render

Wings 3D