Google Sketchup can also be a cool complement in box/ poly modeling prog because it has the same spirit of easy ergonomy!
Specialised in architecture but now it can make many more and the version 7 is coming soon ;)
(and it's free so not a great risk to try it :)
And more important of course MOi has the SKP export file format for it! :)
http://sketchup.google.com/
Another thing : in 3Dwarehouse you can find any 3D models of anything in SKP format
That can be time saving for many works!
Loading is direct from the GoogleSketchup prog!
http://sketchup.google.com/3dwarehouse/