That works OK, as long as you add a Push modifier to the wireframe model. I like renders where the wireframe is understated, say 33% solid on top of the shaded model. I also like it sometimes when the shaded model is flatshaded instead of smooth, but I think that depends on what you want to show.
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snotmonsters EdgeMap
http://www.bytegeistsoftware.com/prod01.htm