Hi Drakon, yup MoI should work well for that!

I think for Carrara you would want to use OBJ format export from MoI, and MoI also supports LWO export for going to LightWave.

You should be able to give it a try with the MoI trial version from here:
http://moi3d.com/download.htm

Just open your IGES file, and then do a "Save As" using OBJ or LWO...

- Michael