There's some really professional models I've downloaded from the freestuff area by this guy I'm linking to.  I don't think they are meant for Poser, but all the OBJ zip files contain one OBJ file with "Blender" in the title, which imports perfectly into Blender.  There's also one for "Poser", which I'm assuming is for that application.  Not sure what he did to the obj to make it import so nicely into Blender, but there's always several OBJ files of his objects, and one is always labeled "Blender", and that's the one I always use.  All the models I've tried so far were modeled extremely well, and contain all quad surfaces, so they can be subdivided nicely if you wanted to.

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Xandra