Alex Schreyer has put together a group of videos on renderers for SketchUp.  They are all produced by the manufacturers.  They will all look good but they may be less than friendly to use.  Most will give you a trial time to use them to help you see if they will work in your situation.

http://www.alexschreyer.net/cad/rendering-in-sketchup-a-video-overview/

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