much cheaper, running on AMD and into realism as well is the Reality / Luxrender route. But it's far from speedy and not interactive.

Somewhere on the web there is a free Pose2Lux plugin around, addressing LuxRender as well. 

Taking your Poser scene into (free) Blender and then into other (free) unbiased render engines  is another alternative. Cycles, Kirkythea, etc. Somewhere in this forum someone even reported about using the free Renderman. So there are lots of alternatives. But in general, high speed plus high quality plus high functionality does come with costs.

 have fun. 

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though