Geospatial Modelling Environment http://www.spatialecology.com/gme/, the replacement software for Hawth's Tools can do this with the isopleth command and the appropriate where clause. It is now stand alone software rather than an ArcGIS extension and requires some script writing. The reference manual can be found here http://www.spatialecology.com/gme/images/SpatialEcologyGME.pdf.
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