Hi David,
I can confirm that EITG is developing actively developing a modeller, you can ask about that on the EITG forums ;).
I model in Maya (CAD accuracy isn't for me) but I get the models to EI via .obj or FBX, I have no problems with file import (I just use file > open for both formats). I regularly export paint FX to EI from Maya too.
I used FormZ 6.6 a little, it's a great, solid modeller, though it never clicked with me (too exact!) :)
Sketchup is great for grabbing models from the 3D warehouse, exporting them to a better modeller, and then adding details to said models yourself, it can be good if you don't have time to start from scratch. But Sketchup really is for fairly basic shapes.
Hope that helps,
Ian