If you want Speed and Quality, I'd suggest looking into Lightwave with PoserFusion.  It translates many textures well, but if your textures are node heavy you will lose a lot of the nodes.  However, it's base raytracer has much higher quality output than Firefly, and is much faster.  You will be looking at some serious cash to acquire it though, and Poser Fusion is only available in Poser Pro or Poser Pro 2010.

The biggest drawback to hosting files in Lightwave is that it does not import camera or light data. Easy fix is when setting up the poser scene focus more on figure placement and posing, then add your lights and camera position after hosting it in Lightwave.

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