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Talking about Rhino etc I think is a bit out of line here.
Hexagon will save to the file types required and is the cheapest. And I think that, at this stage, that is the MOST important.
If working with a friend, it may be worthwhile using Silo (at a higher cost) as you can better communicate.
3D Brush is a bit more problematic in saving to a suitable file type. Really only .obj.
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