Speed44,

As said, I use Rhino. I find for complex models (my Spelljammer ships have vast amount of parts), is to export each area/layer in Rhino out as a seperate .obj, 
I keep each area, say DECKS, or WEAPONS on it's own layer to help with ease of export amongst other things.

Then I Import each set, but do NOT touch anything until the whole thing is imported successfully, and I've checked its ok, as once you move it, you won't be able to realign it perfeclty again from import.

Simpler objects you don't need to do that. :)

This is my Rhino work:
http://www.silverblades-suitcase.com/rhino/rhino3d.htm

"I'd rather be a Fool who believes in Dragons, Than a King who believes in Nothing!" www.silverblades-suitcase.com
Free tutorials, Vue & Bryce materials, Bryce Skies, models, D&D items, stories.
Tutorials on Poser imports to Vue/Bryce, Postwork, Vue rendering/lighting, etc etc!