I tested this. Interesting obj exporter, unfortunately gives wrong topology, the very wrong topology of SU. The SU pro obj exporter works fine, because triangulates everything. In fact if you have SUpro this is the way to go. But SUpro is toooo expensive just for a decent exporter, SU collada is a trash anyway.
Blender gives python error
Zbrush tries to triangulate but gives wrong geometry
3DCoat crashes trying to read this obj
All these on a mac. I don't expect that this works better on windows anyway.
SO, the only way is the SUpro obj exporter. It exports textures too.
For organic shapes you don't need an exporter, the 3ds importer works fine.
You must be sick to model organics in SU. Cars for example. Learn some blender (its free and its the most popular 3d pro app).